For a series such as Ocean Girl, there were quite a number of characters onboard.
Neri | Live actor: Marzena GodeckiThe "Ocean Girl" in question, Neri has grown up on an island for several years until she comes into contact with human civilisation. From there, both sides learn a bit about each other.
- Clap Your Hands If You Believe: Sort of. This tends to be her way to get other people to do things they had never dreamed of. It's more of a confidence boost if anything, but when she applies it, big things happen.
- Does Not Like Shoes: She tends to forgo shoes as much as humanly possible. Most likely because she has no need for them the same way humans do.
- Establishing Character Moment: While the first episode shows her living fairly simply, it's not until the second episode of the series where we see her true nature, as she proceeds to rescue Brett (who she considered a stranger) from food poisoning.
- Friend to All Children: To a point, she's quite friendly with the other children on ORCA.
- Friend to All Living Things: Animals in general however, is where Neri feels most comfortable and only kills to survive, rather than to cause harm.
- Innocently Insensitive: To Mera and Kal at first. In Mera's case she expected her to adjust to "her" lifestyle quickly, without considering Mera's feelings. In Kal's case, she was trying to suppress his curiosity to prevent him from getting hurt. (the latter case sort of puts her into My Beloved Smother territory)
- Literal-Minded: Very much so, but justified in that English is not entirely her first language (at least the way it's spoken on Earth!). She eventually gets over this.
- Ms. Fanservice: Drop dead gorgeous, is often soaking wet, and doesn't wear pants.
- New Powers as the Plot Demands: A couple of small occasions had her do things such as let the others see the ocean through Charley's eyes, which was never spoken of again. Seasons 3 and 4 gave her a whole host of new "powers" to do with Ocean Planet technology.
- Nice Girl: Oh yeah. Some of this crosses into Innocently Insensitive or Refuge in Audacity depending on the situation. She'll open help others out for no other reason than that she can, even if she doesn't know them. (For instance, returning a boy's stolen bracelet or helping a drowned man into a lifeboat and reviving him, the latter of which backfires on her).
- She's Got Legs: Which the many, many shots of her swimming tend to emphasize.
- Stealth Insult: Played with, she's that innocent that she doesn't genuinely mean to harm someone, but a couple of times she'll have a particular inflection in her voice that implies she knows what she's saying.
- You No Take Candle: Her speech pattern counts as this. It's not until Season 4 that she drops this a bit.
Jason Bates | Live actor: David HolfinArguably the main male protagonist throughout the series, he is the first to discover Neri entirely by accident and from then on, develops a friendship that blossoms over time.
- Adorkable: More so in the first two seasons and to a lesser extent in the third season.
- Cassandra Truth: Nobody believes him about the "girl in the sea" at first, apart from Brett. Then it gets real interesting.
- Coming-of-Age Story: The whole series pretty much has him (and Neri) dealing with this. Compare his behaviour between the first season and the fourth season.
- It's All About Me: Has this problem early on, for example, treating Neri like a shiny new toy he doesn't want to share.
- Kid Hero: Every season caps it off with this barring Season 3 oddly enough. (see Season 3 characters)
- The Leader: Can best be described as the unofficial leader of the kids from Season 1-3.
- Loophole Abuse: Manages to use this in Season 2 a couple of times to get around the Commanders no-boats policy.
- Took a Level in Badass: While Seasons 2 and 3 had him assembling a group and pulling off the occasional mission to rescue the series MacGuffin, late Season 3 and Season 4 had him dealing with some fairly heavy things for someone his age. He pulls it off quite well.
Brett Bates | Live actor: Jeffrey walkerJason's younger brother. Unlike Jason, he was actually excited to be on ORCA from the word go and helps set the whole story in motion.
- Annoying Younger Sibling: At first. Jason saw him as such, but by about the middle of the season, he'd calmed down a bit. Season 3 drops this entirely.
- Bratty Half-Pint: At first, at least from the perspective of other adults and older children. He grows out of this though.
- Finger-Licking Poison: His method of meeting with Neri-he consumes some berries on her island, developing a fever and falling ill.
- Idiot Ball/Epic Fail: See above. How he gets onto the island in the first place also counts. He's also more likely to believe certain "stories" than Jason.
- Plucky Comic Relief: A lot of his stories not involving Jason or Neri tend to fall into this category.
- Shipper on Deck: Both played straight and averted. Season 1 has him try and "break up" Commander Lucas and Dianne (due to his friends misunderstandings), while Season 2 has him encouraging Sam and Dianne, Season 3 has him encouraging Camilla and Winston along and at one point he tries to set both Jason and his mother up with other people and fails.
- Tagalong Kid: For a while. It turns out to eventually be the best method to "recruit" people towards Neri.
- Two Lines, No Waiting: A bit of this during Season 3 and to some extent Seasons 1 and 2. He'd get into his own schemes with his friends offscreen while Jason was doing something else with or without Neri, only for the two threads to merge halfway through.
Dr. Dianne Bates | Live actor: Kerry Armstrong/Liz BurchThe boys' mother and a single parent. She brings the kids into ORCA with her, only for one to be reluctant to be on ORCA and the other to be a handful.
- Cool Old Lady: She can definitely hold her own against the likes of Hellegren, the Commanders (multiple), PRAXIS and even her own husband.
- Deadpan Snarker: Season 3 and 4 to some extent.
- Loophole Abuse: In Season 4, a PRAXIS agent proceeds to shut down the entire base, preventing Neri from escaping. Dianne's solution? To calmly walk over to the console and explain to the person at the terminal that they have a "Code" on their hands. This causes the doors to open allowing Neri to escape. She proceeds to turn around and explain to the agents that after a lockdown, opening up the doors is the right way to go to allow personnel to move around.
- She also invokes this in Season 3 and takes great delight in abusing it to allow Winston to stay.
- Heck, this could even count as a staple of hers since all the way back in Season 1, she manages to get around Neri's "daypass" rule.
- Really Gets Around: Implied mostly. Season 2 has her in a relationship of sorts with Capt. Sam, Season 3 and 4 implies some sort of relationship with Officer Hartley while Season 4 also heralds the return of her ex-husband. Nothing really progresses though.
- Team Mom: To Neri and Mera heavily, to Lena less so. She's seen as someone the kids can talk to freely about just about anything.
- You Are in Command Now and Klingon Promotion: Season 3 has her promoted to "Environmental Officer" (which gives her more of a role in the season's B-Plot) while Season 4 just straight-up gives her the commander role.
Dr. Winston Seth | Live actor: Alex PinderA marine geologist, he mainly falls into the role of Dianne's assistant while onboard ORCA.
- Everyone Calls Him "Barkeep": The only people to address him by his last name are people in more authoritative roles such as the Commander in each season, although there is one exception in the first season by Lucas. Everyone else simply refers to him as "Winston."
- Funny Foreigner: More "funny" than foreigner, he was meant to be Indian, but it really only came up a couple of times.
- Good Is Not Soft: He has shown on a couple of occaisons why you should not piss him off.
- Ice-Cream Koan: He was full of these during the first 3 seasons. None of these are actual sayings but are often played for laughs.
- Informed Ability: He's a geologist, not that it comes up in the show very often.
- Intergenerational Friendship: Of sorts with Cass in Season 4 and Joanne back in Season 2.
- Nice Guy: Easily one of the nicest people on ORCA you will ever meet.
- Ooh, Me Accent's Slipping: Tends to drop his "Indian" accent on occasion. Justified however, in that it's implied he's lived in Australia for many years. There are still subtle inflections though from time to time in his voice.
- The Stoic and Tranquil Fury: Whenever someone or something pisses him off, he will handle it as calmly as possible without displaying a hint of anger. Case in point: when he busts an old friend of his spying on him for UBRI, his response is to calmly put her in her place and tell her to leave ORCA without raising his voice once.
- Parental Substitute: Fits into all three depending on the person. While there is never any suggestion of him and Dianne progressing beyond close friends, Neri, Mera, Jason and Brett all see him as a father figure of sorts, while the rest of the kids feel like they can talk to him about anything.
- Why Did It Have to Be Snakes?: Cannot swim (which is somewhat ironic for a marine geologist). Eventually he gets over this and also gains the ability to SCUBA dive in the process.
Mera | Live actor: Lauren HewettNeri's little sister, she's first introduced in Season 2. Over time she adjusts from the society she's lived in to the society where she feels like she belongs.
- Annoying Younger Sibling: To a point in regards to Neri. Her attitude was definitely not a positive one, but this fades very quickly. She still does this sometimes just for personal amusement and to tease Neri.
- Doorstop Baby: a "space" example. She fell from the sky in a capsule, was found by a fisherman and was then taken by Child Services.
- Does Not Like Shoes: She keeps her sneakers for the first few episodes, but then ditches them later on. Seasons 3 and 4 ditch footwear completely.
- Fish out of Water: An inversion. She's familiar with the human society and needs some time adjusting to her newfound world. This becomes lampshaded later in the season when she's back in civilisation and discovers that she prefers the island. Seasons 3 and 4 have her become more and more removed from human society.
- Foster Kid: Was this prior to her being institutionalised.
- Only One Name: After she ditches the name "Jane Seaforth".
- Wise Beyond Their Years: Was seen as this by the instutition and the reason for Hellegren's desire. Her actual skills become more "unlocked" over time. Demonstrated in season 3 and 4 when she's given an entire planet to rule despite being only 13 at the time of her reign beginning.
Vanessa Lane | Live actor: Jaclyn PrinceA somewhat snooty girl at first, Vanessa-like the Bates-arrives on ORCA as a brand-new child. She is one of four children to last longer than a single season, not counting the above-mentioned characters.
- The Atoner: is implied to be this in Season 2.
- Berserk Button: Anything involving Mick at first, then eventually it gets revealed to be anything that she considers to be "unfair."
- Defrosting Ice Queen: So, so much. Early Season 2 still shows us that some of her bitchy tendencies remain, but she's much friendlier to others than she was in Season 1. She even manages to become this to Mick by the end of the series.
- Disc-One Final Boss: Is set up as this at first, but the idea is dropped by the end of the first season. She's definitely bitchy towards a lot of the main cast, if only as a defense mechanism.
- Good Is Not Soft: In Season 2.
- HeelFace Turn: Has this by Season 2. Her establishing moment for that season was to help Neri with some of the more "girly" things that neither Jason or Brett could help with (ie changing clothes).
- Improbable Hairstyle and Anime Hair: Her hairstyle is not entirely odd in itself, however, if you watch a first season episode, you'll see that her hair is MUCH shorter than what it actually appears to be-this comes up a couple of times.
- Informed Ability: Her intelligence. A glance at her grades on the computer screen shows that she's head and shoulders above most of the kids onboard in terms of academic level, but she doesn't really show it much and actually flubs quite a few times.
- Jerkass: See Disc-One Final Boss above, although this is implied to be a defense mechanism.
- Jerkass Has a Point: Rightfully calls out Commander Byrne about her son's behaviour more than once and also calls out several of the other characters for their infarctions during the first season, but drops this by the second season (mostly). She also calls out Commander Byrne after she proceeds to chastise Mick for doing what she asked him to do!
- Love Makes You Dumb: Falls for Mick's cruel joke about mid Season 2. She catches wind of it and handles it quite well, but is shown immediately after to be deeply hurt. Given Vanessa's supposed intelligence, you'd think she would've caught this.
- Put on a Bus: For Season 3.
- Vitriolic Best Buds: Sort of, with the crew by Season 2.
Jake "Froggy" Reilly | Live actor: Joel De CartretA computer "genius" onboard ORCA. Known only as Froggy to his friends.
- Everyone Calls Him "Barkeep": The only people to refer to him by his actual name are both of the Commanders. HELEN will refer to him as "Jake" when addressing a public space, but refers to him as "Froggy" in private. Everyone else addresses him as Froggy.
- Machine Empathy: Taken literally in this case, he's often one of the few who can get HELEN to do whatever they need.
- Playful Hacker: Doesn't really use his skills beyond trying to score some "forbidden food" onboard ORCA and assisting the group with whatever issue they need (faking ID cards, scoring them access to a waverunner or boat, opening locked doors and so on)
- Techno Wizard: Falls into this purely as he is the only one who can fix HELEN and override her. Hilariously lampshaded in a first season episode when Lee and Damien are stuck behind a door. The Commander's solution? Call in an 11-year-old boy!
- Spotlight-Stealing Squad: Given that he (along with Zoe) did not really partake in a lot of missions directly on the island, he sure got a lot of screentime.
- Heterosexual Life-Partners: Appeared to be this with Zoe, there were very few times when they were separated.
- Put on a Bus: For Season 3.
Zoe Kondelos | Live actor: Cassandra McGrathFroggy's "Partner-in-crime" of sorts.
- Decoy Getaway: Pulls this off twice in the series. First season has her use it to lock some UBRI thugs, second season has her acting as Mera's decoy.
- The Generic Girl: Not a lot was developed about her character.
- Flat Character: Not much was really known about her and she was more an extra partner alongside Froggy. Season 2 DID give her some more screentime away from Froggy, pairing her with the other girls onboard ORCA (particularly Kim and Joanne) though.
- Exposition Fairy: To some degree. She'd often explain to Brett what their latest little scheme was or explain other things to other people.
- Heterosexual Life-Partners: With Froggy.
- Put on a Bus: Season 3.
Damien Arthur Geoffries | Live actor: Guy Mallaby
- All Love Is Unrequited: Both for Lee and Neri. Lee at the time is pining for Jason and he really doesn't know much about Neri to consider it anything worthwhile. That said, he's one of the few to accept Neri's "real" background quickly.
- Big Eater: He proceeds to down five meat pies onboard ORCA and it's implied that he's the champion eater onboard.
- Butt-Monkey: Mostly what he was known for onboard ORCA. Usually this was at the hands of Vanessa.
- Fun with Acronyms: There's a reason why he's the only minor character to get his middle name mentioned.
- Heroic BSoD: In a sense. After the eating contest (and subsequent beatdown), he becomes moody and depressed, only to recover when Lee comes to talk to him.
- Nice Guy: He comes across as the sort of guy you can generally be friends with and he tries to get along with everyone on board.
- Unfortunate Names: Or unfortunate nicknames in this case. "Daggy/Dags" may sound like an affectionate term, but in Australia, the term "Daggy" is used to mean something worn or pathetic-looking, which he think he is, but is in fact far from.
- Took a Level in Badass: In one episode with Lee, he figures out that running his guitar through the door can open it and takes a major dump towards tthe end when he goes to help Neri.
- Put on a Bus: End of Season 1.
Jodie | Live actor: Bryony GambleVanessa's friend on ORCA.
- Butt-Monkey and The Chew Toy: Was pretty much this for most of the season...
- Out of Focus: She was lucky to get a scene at all most episodes.
- Put on a Bus: At the end of Season 1.
- The Ditz: Everyone on the base knows Jodie's intelligence level to be extremely subpar.....
Lee Lucas | Live actor: Andrea McEwanThe daughter of the commander, she became fast friends with Jason and the gang and wound up being dragged into their adventures on a minor scale.
- Don't Split Us Up: Doesn't want this to happen with her and her father. It's made clear that she's an only child and she adores her father.
- I Am Not My Father: Unlike her father (who is a stickler for the rules), Lee recognises that sometimes you need to break the rules to save lives and will let certain things (such as Froggy's hacking) slide. She also treats the other characters like equals and expects the same in return.
- Nice Girl: Is seen as a foil to both Vanessa and Jodie in that she's fairly calm, very kind to others and will comfort others if things go pear-shaped. (Such as Damien getting humiliated by Vanessa)
- Nice to the Waiter: Of sorts. While she's the Commander's daughter, she treats everyone else onboard like they're equal and not beneath her, so it fits this trope.
- Put on a Bus: After Season 1.
- Romantic False Lead: The series was ready to set her up as the girlfriend to Jason before ditching this in favour of a relationship with Jason and Neri.
Commander Jack Lucas | Live actor: William McInnesThe Commander of ORCA and a stickler for the rules.
- Defrosting Ice King: Over the season, he begins to soften his stance, to the point where by the finale, he listens to his daughter and tells her how proud he is of her actions.
- Friend to All Children: Averted. He makes it clear on several occasions that he doesn't like children onboard ORCA, but will begrudgingly put up with them. This extends to his own daughter too.
- First-Name Basis: Gradually starts to address other characters by this in the middle of the season and is himself referred to as such by the end of the season by Dianne.
- Put on a Bus: end of Season 1.
- Rules Lawyer: Pretty much his other main role.
Dr. Hellegren | Live actor: Nicholas BellThe Big Bad of a rival scientific institute, he slowly suffers a Villainous Breakdown over the course of the series as he becomes obsessed with this "Ocean Girl."
- Ascended Extra: Appeared in the last 2 episodes of Season 1, while Seasons 2 and 3 set him up as the Big Bad.
- Even Evil Has Standards: Despite Kal being from the Planet of Oceans (and thus being prime scientific material), Hellegren merely just imprisons him, rather than outright killing or experimenting on him. Possibly justified as it's a kids show. He also refuses to hurt his daughter when she jumps into the water at the end of the third season and tries to save her.
- Herr Doktor: Could be classified as this. He has a somewhat odd accent, despite living in Australia. The unofficial novelization makes him Eastern European, however, his surname would put him as being closer to Germanic.
- Last-Name Basis: We never do find out his first name-even the media kits and the credits list him as "Hellegren."
- Light Is Not Good and Good Colours, Evil Colours: You would think that a company that wears white jumpsuits constantly is a "good" company. Not so. At best, they're just slightly unethical and at worst, they are a power-hungry organisation. Hellegren is also never seen in anything other than white or black.
- Limited Wardrobe: His outfits over the course of 2.5 seasons: a white jumpsuit. a black suit. That's it. On occasion he ditches the jacket, showing a white shirt with black pants.
- Manipulative Bastard: Successfully manages to manipulate Kal into doing his dirty work. Also manages to evade Lena's questioning up until around halfway through Season 3. He even manages to convince ORCA that his blasting is not wrecking the seabed.
- Papa Wolf: Is this towards Lena, to the point of sending her off to boarding school to protect her. It's also his downfall.
- Villainous Breakdown: Done very slowly. In the closing part of Season 1, he just wants to capture Charlie because he believes it's special. Season 2, he's just obsessed with Neri (and later Mera), while Season 3 slowly has him descending into Mad Scientist territory as he tries to capture the synchronium pieces.
- What the Hell Is That Accent?: Nicholas Bell seems to portray him as a German scientist, but the accent is a generic Eastern European one. It also will slip on occasion.
Commander Kate Byrne | Live actor: Pamela RabeThe new Commander for ORCA during the second season. Quite no-nonsense and unlike her predecessor, is more tolerant of the children onboard...to a point. Stern businesswoman, there is more to her being on ORCA than meets the eye.
- Badass Boast: When she gets wind of who broke HELEN, she proceeds to capture Forsyth and pretty much gives him one of these, while Froggy and Rocky are smirking in the background.
- Defrosting Ice Queen: By the end of the season. It's implied that Vanessa had a hand in this.
- Everybody Calls Him "Barkeep": Unlike her predecessor, she's never referred to by her first name, with her first name (Kate) only showing up in media kits. Everyone tends to address her as "Commander" with "Byrne" being reserved for conversations between the kids, Dianne, Sam and Winston.
- Family Versus Career: Outside of her ORCA life, she tends to put her career ahead of her son and tends to brush off anyone complaining about his behaviour.
- Parental Neglect: To some degree with Mick, she will brush off any complaints about her son under the belief that he is "settling in" and then when she is forced to actually crack down, doesn't give him any serious punishment beyond assigning him to help out the main cast. Her method for dealing with her son's reading problem? Give him a book and expect him to work on it on his own. Sort of crosses over with Parents as People.
- Put on a Bus: End of Season 2.
Captain Sam Phillips | Live actor: Terry Serio
- The Captain: Labelled as such, but was more the captain of a survey boat. It was implied however that he had run some expeditions previously elsewhere.
- The Casanova: To some extent with Dianne.
- Cool Boat: Wanted this.
- Prospector: Of the sea variety. He manages to find a massive chunk of titanium in the reef and is faced with a moral dilemma when he meets Neri.
- Parental Substitute: Jason feared he was turning into this as he was constantly flirting with Dianne.
- Moral Dilemma: was faced with this on a few occasions: namely whether he was going the wrong way with Jason (not so much Brett) accepting him and when he does have the titanium, whether to keep the knowledge a secret or sell the knowledge to get his Cool Boat.
Michael "Mick" Byrne | Live actor: Anthony Hayes
- Cannot Spit It Out: To Vanessa in the second half of the series and later he struggles with getting his mother to listen.
- Crossdresser: At the end of the season where he acts as the decoy for Neri.
- Foil: To Jason. It gets better though.
- Jerkass: At first.
- Jerk with a Heart of Gold: After meeting Neri and having his HeelFace Turn, he still had his jerkassish moments, particularly when confronted with situations that he wasn't particularly fond of.
- "L" Is for "Dyslexia": It's implied to be this by his mother. The actual portrayal is more implied to be just simple illiteracy rather than genuine dyslexia though. Somewhat Truth in Television, as the conversation he has with his mother suggests that he was moved around a lot and barely spent time with his mother, who would not have picked up on it and moving schools would not have been good for him.
- Off to Boarding School: In the past.
- Reluctant Hero: At the end of the season, he gets dragged into the situation with Neri as a decoy. Hilarity Ensues.
Robert "Rocky" Rhodes | Live actor: Sam Jones
- Adorkable: Very much so.
- Butt-Monkey: A few occasions, but unlike Damien, he was more accepted by the main cast and also seems to be OK with this role.
- Expy: Of Damien, but unlike Damien, he's more comfortable with who he is.
- Informed Ability: Apparently is able to fix motors and is suggested to have some technical skills. We only see this on a couple of occasions.
- Motor Mouth: Does NOT shut up about his favourite sci-fi movies.
- Nice Guy: While he got very little character development over the series, what we did see of him was that he was a genuinely nice guy and willing to help others out without any question.
- Percussive Maintenance: Does this to HELEN in the last episode after Froggy has all but given up on her. It works.
- Plucky Comic Relief: Sort of fell into this role throughout the season, unfortunately due to Mick's schemes.
- Wide-Eyed Idealist: Very much the idealist part and he shares this with his sister.
Joanne Rhodes | Live actor: Kirsty Barnes Cullen
- Expy: Of Zoe, in a sense.
- The Generic Girl: Very much so, she was somewhat of a flat character.
- Intergenerational Friendship: With Winston, although it occasionally delved into Precocious Crush at times.
- Precocious Crush: Developed one of these with Winston after he supposedly rescues her. This apparently continued even after it was revealed that he hadn't rescued her, but Neri had.
- Wide-Eyed Idealist: Shared this trait with her brother.
Kimberly McGuinness | Live actor: Claudia Buttazzoni
- All There in the Manual: Apparently had several older brothers, but we never saw this.
- Flat Character: Sort of. What little development we do see implies that she was meant to be an expy of Vanessa.
- Out of Focus: Compared to the others, she got very little screentime and what we do see involved her grumbling about either Mick, ORCA or some other aspect.
- Put on a Bus: After Season 2.
- Tomboy with a Girly Streak: She's a champion level athlete and is not afraid to intimidate tough guys, but has a passion and great skill as a hairstylist.
Benny Malkovitch | Live actor: Sudi De Winter
- Epic Fail: Goes out on an expedition to find a (fictional) sunken ship, believing it actually exists. Aside from the fact that said ship doesn't exist in real life, chances are that it would've been discovered by the time of the series. Then again, it does set up a nice Contrived Coincidence.
- Expy: is this of Froggy in the first half of the season, before being replaced by Lena.
- Moral Dilemma: has a few of these over the course of the series, mostly around him disobeying his father.
- Nice Guy: Despite his Rules Lawyer tendencies, he is shown to be a generally nice guy who will help others out, even reluctantly.
- Rules Lawyer: Tends to waver between Lawful Evil and Lawful Good, as he's the one to often quote rules to the others.
- The Smart Guy: He's often shown studying or similar-it's heavily suggested that this is more due to his dad's influence.
- Teen Genius: At times. How many 12/13-year-old kids do you know are studying physics?
- Took a Level in Badass: Towards the end of the series, best exemplified by him standing up to his dad.
- What Could Have Been: The original plans for Season 3 had Benny being named Tommy instead and his personality changes from reserved and reluctant to an enthusiastic dreamer and attempted entrepeneur who would've attempted to sell Neri's story to the world had Brett not asked him to keep it quiet. See here.
Cassandra 'Cass' Clayborn | Live actor: Brooke "Mikey" Anderson
- Bash Sisters: with Lena. Despite not trusting her, it's shown that the two work well together. A more literal case exists with her sister.
- Bad Dreams: Starts having these about halfway through the season due to her Easy Amnesia. It takes a therapist (of sorts) for her to stop having these dreams.
- Easy Amnesia: Suffers from this in the first half of the season after getting hit in the head with a bowsprit.
- Informed Ability: Has been on marine installations since she was a child and knows how to use a sailboat. We never see this ability after her introductory episode though.
- Knight Templar: Of sorts, she's fiercely protective of her friends, sticking up for them if needed and is the only one reluctant to trust Lena after she comes on ORCA. Partially justified, in that she'd only just met Neri the previous episode and is trying to atone in a sense.
- Little Miss Snarker: Nearly everything that comes out of her mouth is snark aimed at someone.
- Nice Girl: Becomes this after she meets Neri, although this is hinted at early on when she looks after a refugee stowaway onboard. It's also telling that among the first words out of her mouth to Neri were "I wanna help and I won't tell."
- Odd Friendship: She tends to be paired with Winston quite a bit for a reason that is never fully made clear. By Season 4, she's essentially his "assistant."
- Out of Focus: Season 4 still has her onboard, but doesn't give her as much screentime.
- Ooh, Me Accent's Slipping: Brooke tends to slip out of her "Soft" American accent a number of times throughout her 2 seasons.
- The Prankster: at first. Mainly this is aimed towards Brett and is implied to be out of boredom, as she stops pulling pranks after she learns how to dive.
Cadet Leader Morgan Clayborn | Live actor: Verity McIntyreCass's older sister and the cadet leader.
- Alpha Bitch: Seems to be her default mode, with no real reason given behind this. In fact, the only time she actually appears to "soften" is when she gets hurt by a stonefish.
- Bothering by the Book: On more than one occasion. It's gone both ways-she's used it successfully to punish Brett, Cass and Benny, while it's backfired on her when Jason was trying to rescue Benny.
- Jerkass: To Cass in particular. While she does punish Brett and Benny for their misdemeanours, she seems to reserve the nastiest punishments for Cass. The two have also had some quite nasty verbal spats. Outside of family, this seems to be her default mode towards pretty much anyone who's not the Commander.
- Laser-Guided Karma: Towards the end of the season, she places her hand on a stonefish and is injected with its venom. Given the way she's treated Jason and Cass throughout the season, you're kind of left thinking "she deserved it."
- Mean Boss: To Jason and Sallyanne. Even Hartley and the Commander have called her out on this on separate occasions.
- Obstructive Bureaucrat: Is this to Jason. Cass calls her out on it a couple of times, which has led to some nasty spats.
Sallyanne Taylor | Live actor: Olivia Haddlestone
- Cannot Spit It Out: She struggles to tell Jason about her feelings for him. When she does, she's rejected.
- The Generic Girl: Doesn't really have any major positive or negative traits. See What Could Have Been
- Informed Ability: Apparently had no trouble with flying the helicopter, despite her lack of confidence during a crisis.
- Nice Girl: Comforts Jason after he struggles with Morgan's stonefish attack, rescues Benny from the radioactive storeroom and spends time talking with Kal.
- Self-Deprecation: Does this quite a bit throughout the series, blaming herself for every problem the pair has. Jason refuses to let her have the blame and makes it clear that they're a team.
- The Woobie: is constantly rejected by Jason, although it's unintentional on his end. On top of that, Morgan seems to take delight in berating her for any problem however slight.
- What Could Have Been: In the original treatment for Season 3, her personality was more humorous and she would've been depicted as a no-nonsense self-reliant girl who did not get along with Dave. The end result strips her of these qualities and has Dave patiently working with her.
Lena Hellegren | Live actor: Joelene Crnogorac
- The Atoner: While she herself has not done anything bad, she appears to be trying to make up for her father's mistakes.
- Did You Just Flip Off Cthulhu?: Manages to take on her father singlehandedly by threatening to go to the media and getting UBRI shut down if he doesn't stop harassing her.
- Hollywood Hacking: She's depicted as some kind of super-hacker once onboard ORCA, but this is soon dropped in favour of her merely showing some skills that wouldn't be too far beyond her age.
- I Am Not My Father: Gradually becomes this to Jason, then Brett, then Cass. It appears to be this with Dianne at first, but she puts her trust in the boys.
- Mistaken For Spy: Mainly by Cass, although Jason and Brett believe this at first. They eventually come to trust her, especially after she reveals what's happening to Brett.
- Naïve Newcomer: Is this at first, believing that her father is innocent and that Jason and Brett are lying to her. She gets better though.
- Nice Girl: Refuses to let Brett and co. come to harm and informs Jason of this. On the flipside, she also refuses to outright hurt her dad or any other mooks.
- Doting Parent: Has this in the form of Hellegren.
- Techno Wizard: Becomes the crew's computer genius in the second half of the season, but prior to that is shown using her skills to find out her father's work.
- What Could Have Been: In the Season 3 treatment, she would've been named Greta, there would've been more of a relationship shown between her and Dianne (as opposed to Dianne simply taking her in and questioning the boys decision) and there were signs of a romantic relationship with Brett.
Dave Hartley | Live actor:ORCA's "First Officer" for the third and fourth series.
- Friend to All Children: Is one of the few adults on the show who is genuinely nice towards the "children" onboard, offering them skills and chances instead of punishing them.
- Nice Guy: To everyone. He also becomes somewhat of an ally to the crew, making it clear that he doesn't support the Commander's position in regards to Hellegren.
- Ship Tease: heavily implied with Dianne, but it doesn't progress beyond the occasional chat. Unlike the last two pairings though, both Jason and Brett appear to have no problem with this.