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This is the page for characters original to Mario Tennis.
If you were looking for Waluigi, his tropes can be found here.

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    Introduced in Mario Tennis (GBC) 

Alex

https://static.tvtropes.org/pmwiki/pub/images/img_1099.png
Click here to see Alex’s in-game design
Click here to see his appearance in Power Tour

The male player character, and the champion of the Island Open tournament.


  • The Ace: Alex beat Mario and Peach in tennis and won the singles and doubles championships from the Island Open tournament. Additionally, he’s considered the best tennis player at the academy.
  • Amazing Technicolor Population: Unlike the other human characters, who have relatively normal skin colors, Alex has red skin in the original game. Justified, as this seems to be from palette limitations on Game Boy Color.
  • Color-Coded Characters: In the original game, the player and partner characters are colored as the following:
    • Alex - Red, White
    • Harry - Orange, White
    • Kate - White, Pink
    • Nina - White, Orange
  • Cutting Off the Branches: The GBA version establishes him as the one who achieved the Island Open championship for the Academy and went on to face Mario.
  • Inconsistent Coloring: Alex is the biggest example by far, his colors have changed between every Mario Tennis he’s appeared in.
    • In the artwork for the GBC game, his palette consisted solely of warm colors; his hat is yellow, his shirt is orange, while his shorts, shoes, and wrist band are red. His hair was also black and his skin was fair.
    • Within the GBC game itself, Alex is seen wearing all-white, and his skin is red.
    • When transferred over to the Nintendo 64 game, his hat became blue along with his shorts and shoes, his shirt became black, his wristband became yellow, his hair became brown, and his skin became tan.
    • Finally, Mario Tennis: Power Tour had Alex’s hair shift to a darker brown, and exchanged his black shirt for a green shirt.
  • Nice Guy: Overall, pleasant and modest, guy who will happily coach you and isn’t arrogant, rude, or snarky when compared to other players.
  • Why Did It Have to Be Snakes?: Alex is afraid of the siren that comes from the Tennis Machine after beating it for some reason. This doesn’t stop him from coaching or playing tennis, though.

Nina

https://static.tvtropes.org/pmwiki/pub/images/img_1127.jpeg
Click here to see Nina’s appearance in Power Tour

The female player character.

  • Color-Coded Characters: In the original game, the player and partner characters are colored as the following:
    • Alex - Red, White
    • Harry - Orange, White
    • Kate - White, Pink
    • Nina - White, Orange
  • Curtains Match the Window: Nina has orange hair, orange eyes, along with wearing an orange mini-skirt, and orange shirt. Possibly enforced due to palette limitations.
    • Averted in future appearances, where her eyes are green and her hair is orange/brown.
  • Girlish Pigtails: Supports a braided pair.
  • Idiot Hair: Has hers pointing up in the first game, and down in the last game.
  • Primary-Color Champion: Inverted with Nina’s initial appearance as the protagonist, she wears an orange shirt, mini-skirt, has orange hair, and she has orange eyes.

Harry

https://static.tvtropes.org/pmwiki/pub/images/img_1124.jpeg
Click here to see Harry’s “Power Tour” design.

The male Doubles partner.

  • The Ace: Won the Island Open Doubles with Alex, then went on to defeat Mario and Peach with him. Come the sequel, he's one of the main coaches and implied to be second-in-command to Alex.
  • Ambiguously Brown: Harry has a darker complexion than most other characters in the GBC release of “Mario Tennis”, but his skin isn’t that dark, so it’s downplayed.
    • Averted in “Power Tour” where Harry is relatively light-skinned.
  • Color-Coded Characters: In the original game, the player and partner characters are colored as the following:
    • Alex - Red, White
    • Harry - Orange, White
    • Kate - White, Pink
    • Nina - White, Orange
  • Hot-Blooded: Harry has a couple of hot-blooded traits when it comes to tennis. This can be seen when he acts like your rival for a brief moment after you do a round against the tennis machine.
  • Love Confession: If the player transfers Kate to Mario Tennis 64 and she wins a tournament, her tournament celebration cutscene will involve Harry confessing to Kate. Unfortunately, Kate rejects him.
  • Pink Girl, Blue Boy: Played With. Harry is the “Blue Boy” to Kate’s “Pink Girl,” but to varying degrees depending on the game.
    • In the Game Boy Color version of Mario Tennis, he hardly wore any blue besides his sleeves, making him a downplayed variation of the trope.
    • The Nintendo 64 and GBA games play the trope straight, adding blue shorts and blue streaks on the side of the shirt, respectively.
  • Satellite Character: Harry doesn’t have personality or individuality besides being your doubles partner in the first game. Averted in Power Tour, where he’s now a coach with his own personality, and his own interests.
  • Ship Tease: With Kate.

Kate

https://static.tvtropes.org/pmwiki/pub/images/img_1128.jpeg
Click here to see Kate’s appearance in Power Tour.

The female Doubles partner.


Allie

https://static.tvtropes.org/pmwiki/pub/images/img_1200_7.png

A student of the Royal Tennis Academy, and a Speed-type character. He's the 2nd rank of the Senior Singles rankings, and shares the 1st rank of Senior Doubles with Fay, until the player defeats him.

He’s one of six characters, unlockable from the start of the game. (Not including the Mario Tour Protagonists.)

Joy

https://static.tvtropes.org/pmwiki/pub/images/img_1129.png

Joy is an unranked junior tennis player and a Technique-type character, and unlike Alex, Nina, Harry, and Kate, she doesn’t need to be created in Mario Tour. Joy is playable in exhibition mode from the beginning of the game.


  • Curtains Match the Windows: According to her sprite, Joy has green eyes, and green hair.
  • Love Freak: There’s hints of it… most of Joy’s dialogue has her talk about love, specifically in how she seems to believe that love was the definitive cause for Alex/Nina’s rise from Junior class, to Senior class.
  • Meaningful Name: Joy’s Japanese name is Love, as in the tennis phrase. Additionally, Joy occasionally talks about love, more specifically, about how your love is what caused you to rise up in the rankings.

Brian

https://static.tvtropes.org/pmwiki/pub/images/img_1201.png

A student of the Royal Tennis Academy, ranked 4th in the Senior class, and an All-Around-type character.

Pam

https://static.tvtropes.org/pmwiki/pub/images/img_1197_9.png

A student of the Royal Tennis Academy, and an All-Around-type character. She's the 4th rank player of the Junior class in Singles, and in Doubles, she is paired with Beth and share the 2nd rank.


Bob

https://static.tvtropes.org/pmwiki/pub/images/img_1198_0.png

A Power-type character. Though he starts as the 1st rank of the Junior class, he eventually reaches 4th rank of Varsity class, and must be defeated by the player to qualify for the Island Open tournament.


  • Eyes Out of Sight: His eyes can’t be seen because his hair covers his eyes.
  • Fat and Skinny: Bob and his doubles partner, Curt, respectively.
  • Hidden Depths: Bob is the only one of the characters you’ve defeated to move up in the rankings, considering none of the other Junior or Senior Class characters seem to do this it comes of as quite impressive.
  • Secret Character: Unlocked by completing Singles in Junior Champ

Beth

https://static.tvtropes.org/pmwiki/pub/images/img_1199.png

Pam's Doubles partner, and a Speed-type character.


Fay

https://static.tvtropes.org/pmwiki/pub/images/img_1296_5.png

A Power-type player with above average speed, but low control. She is the champion of the Senior class in both Singles and Doubles until the player defeats her. In Senior Doubles, she was paired with Allie and belonged to the highest rank. In Junior Doubles, she was paired with Brian and belonged to the lowest rank of the Junior class.


Curt

https://static.tvtropes.org/pmwiki/pub/images/img_1293.png

A Tricky-type player who's the 3rd rank of Junior division, until the player defeats him.


  • Fat and Skinny: Curt is a skinny, lanky, and tricky tennis player, to contrast Bob’s large, hefty, power tennis player.
  • Secret Character: Unlocked by completing Singles in Senior Champ

Mark

https://static.tvtropes.org/pmwiki/pub/images/img_1247.png
Click here to see Mark's original design.
An All-Around-type member of the tennis Varsity team. To qualify for the Doubles version of the Island Open tournament, the player has to face him and Bob. In Mario Tennis: Power Tour, he is the coach of the Junior class at the Royal Tennis Academy.
  • Chromatic Arrangement: The three coaches form a downplayed variation, Mark is red (with orange), Kevin is blue (his eyes, hair, and clothes), and Emily is yellow (due to her blonde hair).
  • Secret Character: Unlocked by defeating him in Mario Tour in a Doubles match

Sammi

https://static.tvtropes.org/pmwiki/pub/images/img_1157.jpeg
The green girl on the right.
A Techinique-type player encountered at the Island Open.
  • Secret Character: Unlocked by defeating her in Mario Tour in a Singles or Doubles match in the Island Open

Sean

https://static.tvtropes.org/pmwiki/pub/images/img_1157.jpeg
The guy on the left in glasses.
An All-Around-type player, and Sammi's partner in the Doubles version of the Island Open.
  • Secret Character: Unlocked by defeating him in Mario Tour in a Doubles match in the Island Open

Spike

An All-Around-type that the player will fight in the second round of the Island Open tournament. His drop shot is unlike any other in the game; it curves with a violent sidespin.
  • Secret Character: Unlocked by defeating him in Mario Tour in a Singles or Doubles match in the Island Open

Elden

A Speed-type player, and Spike's tennis partner.
  • Secret Character: Unlocked by defeating him in Mario Tour in a Doubles match in the Island Open

Emily

https://static.tvtropes.org/pmwiki/pub/images/img_1132.jpeg
Click here to see Emily's original design.
A Speed-type player, and a ranked member of the Varsity Class at the Royal Tennis Academy. The player faces her in the semifinal round of the Island Open Singles tournament. In the Doubles tournament, her partner is Kevin, and they lose to A. Coz and B. Coz from Factory in the semifinal round. She had an ability to do a large dash to return the tennis ball. In Mario Tennis: Power Tour, she's the coach of the Senior Class.
  • Ambiguously Brown: Emily has dark tan skin in the first game, but it’s never said why, however, considering Emily is light-skinned by Power Tour it’s possible it was just a tan.
  • Chromatic Arrangement: The three coaches form a downplayed variation, Mark is red (with orange), Kevin is blue (his eyes, hair, and clothes), and Emily is yellow (due to her blonde hair).
  • Ms. Exposition: Emily becomes this when you select the Dictionary, as she’ll read tennis terms straight out the dictionary.
  • Nice Girl: Arguably one of the nicest game. Besides her generally pleasant demeanor, when she introduces herself and sees you’ve hit your head, she’ll wait you for to recover if you say you’re not okay, and gives a tour of the academy afterwards. Later on, you can her extending her kindness to her fellow coaches/friends, Kevin and Mark.
  • Passionate Sports Girl: Emily is very passionate about tennis, at least passionate enough about it to help the player play in both the GBC game, and Power Tour, and encouraged the player to not give up. Emily even made it to the semifinals of the Singles Island Open. Furthermore, Emily’s the coach of the Senior Class at Royal Tennis Academy.
  • Pre-Final Boss: Emily is the second to last character you go against in the GBC game, with her being the fought in the semifinals of the Island Open.
  • Secret Character: She's unlocked by defeating her in Mario Tour in a Singles match in the Island Open

Kevin (known as Claudio in Italian)

https://static.tvtropes.org/pmwiki/pub/images/img_1229.png
Click here to see Kevin in Advance Tour next to Elroy.

A non-playable character in Mario Tennis (GBC) and Mario Tennis: Power Tour. In the Game Boy Color game, he is the highest-ranking player at the Academy, although that changes once the player wins the Island Open. In the Game Boy Advance game, he's the coach of the Academy's Varsity Class.


  • Chromatic Arrangement: The three coaches form a downplayed variation, Mark is red (with orange), Kevin is blue (his eyes, hair, and clothes), and Emily is yellow (due to her blonde hair).
  • Curtains Match the Window: Downplayed in the first game, where Kevin’s hair is a darker shade of blue than his eyes. Played straight in Power Tour, where he has black eyes and hair of the same shade.
  • Dub Name Change: The Italian name given to Kevin is Claudio, or Claude.
  • Inconsistent Coloring: His clothes are given darker colors in Power Tour, it’s mostly noticeable in his shirt going from a light, sky blue, to a more standard blue. Additionally, his hair and eyes used to blue, before being changed to black.
  • The Unfought: Kevin is a particularly interesting example, unlike his fellow varsity players (or coaches in Power Tour), Emily and Mark, Kevin isn’t playable due to never being fought by the player in any of the Mario Tennis games.

A. Coz

The eldest Costello brother, and a Tricky-type tennis player. Hailing from the rival Factory school, his first time in the Island Open tournament is the same as the player's. In Mario Tennis: Power Tour, he and B. Coz are now coaches at Factory.
  • Big, Thin, Short Trio: Between the three Costello Brothers, A. Coz is the Thin and the middle ground in terms of height, B. Coz is the Big being the largest, and most muscular of the brothers, and Willy is the Short, being a little pudgy and the shortest of the three boys.
  • Final Boss: He's always fought at the end of the Island Open, in both Singles and Doubles.
  • Last-Name Basis: Played With. While the first initial of his name is said, we never know his full name, and he is instead usually called A. Coz, his last name is short for Costello.
  • Secret Character: He's unlocked by defeating him in Mario Tour in a Singles or Doubles match in the Island Open
  • Stealth Pun: His name could be read as the French word á cause, which would translate to because.

B. Coz

A Power-type character, and Doubles partner with his older brother A.Coz.
  • Big Little Brother: In spite, of being the younger brother, B. Coz is a titan in height compared to his older brother, A. Coz. Averted with Willy, B. Coz is far taller than Willy.
  • Big, Thin, Short Trio: Between the three Costello Brothers, A. Coz is the Thin and the middle ground in terms of height, B. Coz is the Big being the largest, and most muscular of the brothers, and Willy is the short, being a little pudgy and the shortest of the three boys.
  • Final Boss: Is fought alongside his brother in the Island Open Doubles.
  • Gonk: He’s designed in such a way to where he looks grotesque, especially when compared to the other tennis players, child characters, and humans.
  • Last-Name Basis: Played With. While the first initial of his name is said, we never know his full name, and he is instead usually called B. Coz, his last name is short for Costello.
  • Mighty Glacier: Being a slower, power type with poor control, this is expected.
  • Punny Name: B. Coz, sounds like because.
  • Secret Character: Unlocked by defeating him in Mario Tour in a Doubles match in the Island Open
  • The Unfought: In the Island Open Singles, he loses to Emily and the player faces her in the semi-final instead.

    Introduced in Mario Tennis: Power Tour 

Clay (known as Max in Europe and Nōti in Japan)

https://static.tvtropes.org/pmwiki/pub/images/img_1089.jpeg

The male player character. If not chosen, he still appears as Ace's Doubles partner.


Ace (known as Tina in Europe and Tabby in Japan)

https://static.tvtropes.org/pmwiki/pub/images/img_1088_6.jpeg
The Tomboy Tennis Player.

The female player character. If not chosen, she still appears as Clay's Doubles partner.


Sophia

https://static.tvtropes.org/pmwiki/pub/images/img_1303.png
Click here to see Sophia’s portrait in Power Tour.

A student of the Royal Tennis Academy, ranking 4th in both Junior Singles and Doubles. She is an All-Around-type.


Meg

https://static.tvtropes.org/pmwiki/pub/images/img_1305_22.png
Click here to see Meg’s portrait in Power Tour.

Sophia's Doubles partner, and a Technique-type player.


Mason

https://static.tvtropes.org/pmwiki/pub/images/img_1307_4.png

A self-proclaimed "tennis phenom" at the Royal Tennis Academy, ranking 3rd in Junior Singles.


  • Anime Hair: Mason’s hair is gloriously spiky.
  • Cloudcuckoolander: Has these tendencies, calling himself "yours truly" and insisting he's a "tennis phenom" (before switching that adjective to your characther)
  • Miles Gloriosus: For all his talk about being a "tennis phenom", he never ranks above second place in juniors.
  • Small Name, Big Ego: He thinks he'll easily win against you and makes excuses after losing, but in his own way, later on admits he was wrong (by calling you both "phenoms" before switching to just you). At the end, after learning a "power shot" (his doubles partner isn't so sure it's a power shot, though), he regains this.
  • Vicariously Ambitious: Once he sees how great the player is, he begins referring to Ace or Clay as the "tennis phenom", perhaps to live vicariously his dreams through them.

Chad

Mason's Doubles partner, and a Power-type player.
  • Broken Pedestal: Downplayed, he thinks Mason is a phenom at first before eventually realizing he's a bit full of himself, despite his flaws, seems to still consider him a friend and wants to help him get better.

Sasha

A student at the Royal Tennis Academy, a Tactical/Technique-type player ranking in 2nd in Junior Singles.

Sylvia

https://static.tvtropes.org/pmwiki/pub/images/img_1249.png

Sasha's Doubles partner, a Speedy-type player.


  • Blatant Lies: When she faces you, she says she saw your talent all along.
  • Defeat Means Friendship: She's probably the friendliest Juniors opponent post-defeat. She even confides in you things that she doesn't even tell Sasha.
  • Puppy Love: Downplayed. There are a few signs that she likes your character (the text also heavily implies a crush when you play as Clay) but that never go anywhere.
  • Tsundere: Mild example; when you start out, she says it'll be "decades" before you face her. However, win your first match and she takes a liking to you.
  • Weakened by the Light: She's sensitive to the sun as she's always wincing and has her hand on her forehead shielding her eyes from the sun, which may explain her lack of progress.

Chris

A student at the Royal Tennis Academy, ranked 1st in Junior singles and doubles a Technique-type player.
  • Armor-Piercing Question: Your character's doubles partner delivers one when asking him if he's staying with the juniors because he's afraid of the seniors. He acknowledges reluctantly that this is true.
  • Berserk Button: Doesn't handle well being called out for hanging out among the juniors despite being an unranked senior as well.
  • Normal Fish in a Tiny Pond: Your doubles partner calls him out on this after he admits that senior class intimidates him and it hits a nerve, he finally agrees to practice with the seniors.
  • What Happened to the Mouse?: Is never seen again after his defeat in Juniors Class.

Kyle

Chris's doubles partner
  • Normal Fish in a Tiny Pond: Realizing that, like his partner, he stays in junior class to feel safe, similarly hits a nerve for him.

Shawn

A student at the Royal Tennis Academy, the 4th ranked senior doubles player.

Linda

https://static.tvtropes.org/pmwiki/pub/images/img_1248_2.png

A student at the Royal Tennis Academy, the 4th ranked senior doubles player.


Gary


  • Graceful Loser: Admits you're better than he is, and even calls himself out for overconfidence after you beat Roy.
  • Small Name, Big Ego: He calls himself the "senior sentry", thinking it's his job to test new players. He handles the loss fairly well and becomes a lot more humble afterwards. He regains this after learning a basic power shot after you won the Island Open, wondering if he can beat you.
  • Team Spirit: Very heavily emphasizes the importance of teamwork. Him and his doubles partner are more upset over issues with their teamwork than their loss.

Jet

https://static.tvtropes.org/pmwiki/pub/images/img_1091_7.png
Portrait of Jet.

https://static.tvtropes.org/pmwiki/pub/images/img_1092_9.png
Full body image of Jet.

Kyoko

A student at the Royal Tennis Academy, ranked 3rd in senior singles and 2nd in senior doubles.
  • Brilliant, but Lazy: Everyone sees her as this, a skilled player who lost her drive along the way.

Micki

Emi

A student at the Royal Tennis Academy, ranked 1st in seniors in both singles and doubles.
  • Defeat Means Friendship: At first she's a little upset she lost to you but later on sticks up for you when she joins you in varsity class when the rest of the varsity players seem annoyed that you're representing the academy instead of Elroy.
  • Recurring Boss: In the doubles campaign, she goes against the protagonists twice, once with Roy as the senior champion team, and again with Flit as the rank 3 varsity team.

Roy

Emi's doubles partner, ranked 1st in seniors doubles alongside her, and 2nd in seniors singles.
  • Defeat Means Friendship: Much like Emi, he stands up for you when the Academy seems to have sour grapes that Elroy isn't representing them.
  • Recurring Boss: Like Emi, he faces the protagonists twice in the doubles campaign, firstly alongside her as the senior champion team, before he teams up with Skipper to form the rank 4 varsity team.

Flit

Skipper

Whisker

The second place member of the Royal Tennis Academy's Varsity team, ranked third after you defeat him.

https://static.tvtropes.org/pmwiki/pub/images/img_1094_8.png
https://static.tvtropes.org/pmwiki/pub/images/img_1093_9.png
The Titan-Sized Tennis Player…

  • Boring, but Practical: He tells the others at one point they should have practiced basic tennis more and not based their training so heavily on power shots.
  • Defeat Means Friendship: He becomes your biggest supporter in the Island Open.
  • Face of a Thug: He acts big and scary before a match to gain advantage. Later on he expresses regret.
  • Gentle Giant: Once you get to know him, he’s not rude and is quite friendly, but can be riled by rude (Tori’s) attitudes. He even cheers you on when during some of your matches.
  • Huge Guy, Tiny Girl: Paula is the tiny, pink girl, to Whisker’s huge, hunky guy.

Paula

https://static.tvtropes.org/pmwiki/pub/images/img_1095.png
…and a Pint-Sized Professional!
https://static.tvtropes.org/pmwiki/pub/images/img_1096.png

The fourth place member of the Royal Tennis Academy's Varsity team in singles, second in doubles.


  • Beware the Nice Ones: She's cheerful and friendly, but she once calls out Whisker for rude behavior.
  • Huge Guy, Tiny Girl: Paula is the tiny, pink girl, to Whisker’s huge, muscular guy.
  • Pintsized Powerhouse: Her power shot has the third most knockback, only Whisker and Elroy's are more powerful.

Elroy

https://static.tvtropes.org/pmwiki/pub/images/img_1251.jpeg

The captain of the Royal Tennis Academy's Varsity team, ranked highest in the school when the player arrives, and having lost only to Dweezil in the previous year's Island Open Singles tournament.


  • Older Than They Look: He's one of the oldest players at the academy; it's hinted at that when Elroy started as a junior, Alex, Mark, and Kevin were still varsity players and not yet coaches.
  • Optional Boss: His match at the Varsity class is completely optional, as once you reach the second rank, you automatically qualify for Island Open, and are given the option to either go straight there or stay at the Academy to face Elroy. His Island Open singles match is fully mandatory, regardless of whether you played his first match or not.

Tori

https://static.tvtropes.org/pmwiki/pub/images/img_1250.jpeg

Elroy's Doubles partner, ranked 1st in Varsity Doubles, but 3rd in Varsity Singles. Though arrogant when she and Elroy have a chance of winning, she does show respect to the player when surpassed.


  • It's Personal: Her reaction to Whisker being happy you beat her so he can face you, he wants you to beat Whisker now.
  • Optional Boss: In doubles, she shares this role with Elroy, since you can choose to go to Island Open as soon as you reach the second rank and qualify for the tournament.

Barb

A rival from the Empire school, though she is not considered as much of a threat as her more famous teammates.
  • Oh, Crap!: If you win Doubles Island Open before facing her, she has one about going up against you and begs you to take it easy on her.

Oscar

Barb's Doubles partner, though he is never faced by the player, and cannot be played as in any mode.

Sass

A rival from the Factory school, who never makes it to the big four in any tournament, but was seeded for making the big four the previous year.

Chet

Sass' Doubles partner, who is unplayable.

Chas

A rival from the Union school, who qualified for the Big Four of the previous year's Island Open tournament despite his school's reputation for being a pushover.
  • Underdog Victory: Makes it past the first round of the Island Open singles, in spite of Union’s aforementioned reputation.

Mel

https://static.tvtropes.org/pmwiki/pub/images/img_1245_6.png

Chas' Doubles partner. Wears her hair in buns similar to Chun-Li.


  • Expy: As mentioned above, her design is similar to Chun-Li.

Dweezil

A famous player from the Empire school, who won the Island Open tournament the year before the player attends.
  • The Unfought: In singles, he’s given a fair bit of build up due to being the defending champion, however after the second match, it’s shown that Willy eliminated him, leaving him as this for that campaign. Averted in doubles, where him and Mynx are your opponents for the semi-finals.
  • The Worf Effect: Throughout the Island Open singles, he’s built up as the one to beat, but in the quarter-finals, Willy eliminates him, leaving Dweezil as The Unfought for the singles campaign. In the doubles, you're the one who beats him in the semi-finals.

Mynx

Dweezil's Doubles partner.
  • Oh, Crap!: In the semi-finals of the singles Island Open, she mentions being seen as Empire’s last hope, but outright says she doesn’t think she can beat Willy, since he’s already took out the defending champion.

Willy

https://static.tvtropes.org/pmwiki/pub/images/img_1202_4.png
Your last challenge.

A rookie player from the Factory school that nobody expected to get very far. He's more interested in a good challenge than a victory. He is also the youngest Costello sibling.


  • Big, Thin, Short Trio: Between the three Costello Brothers, A. Coz is the Thin and the middle ground in terms of height, B. Coz is the Big being the largest, and most muscular of the brothers, and Willy is the short, being a little pudgy and the shortest of the three boys.
  • Climax Boss: Is always fought in the final round of the Island Open Singles and Doubles tournaments.
  • Contrasting Sequel Antagonist: To A. Coz. Both boys were trained in the Factory, were rookies that rose in the ranks, and eventually made it to the Island Open. However, whereas A. Coz is a Jerkass who’s rude to the player, Willy is a friendly tennis player, who’s more interested a good challenge, and even gives the player genuine advice to relax and act if nothing were at stake.
    • Willy also serves as this to B. Coz, in terms of physical attributes. Willy being a short, small, somewhat pudgy, and relatively harmless looking, All-Round tennis player; whereas B. Coz serves as a large, hulking, muscular, and threatening, Power-type tennis player.
  • Idiot Hair: He has one atop his head.
  • Punny Name: It’s subtle, but when you give Willy the shortened version of his last name and say it aloud, it sounds like Will he cause?.
  • Shout-Out: Both of his power shots are references to another Camelot developed series, Golden Sun.
    • Willy’s Defensive Power Shot, the Hand-Power Save, sends out a magic hand that grabs the ball, said hand looks like Psynergy from Golden Sun.
    • Willy’s Offensive Power Shot, his Summoner Shot, has a emblem that encases the ball, said emblem shows resemblance to a similar emblem used for Psynergy in Golden Sun.
  • Spirited Competitor: He’s not too concerned over whether he wins or loses, and just desires to face a Worthy Opponent. If talked to before the Island Open finals, he states that he’s just happy to play in the finals, and isn’t worried about the outcome.

Sheri

Willy's Doubles partner.
  • Climax Boss: Of the Island Open Doubles tournament, sharing the role with Willy.
  • Out of Focus: In the singles tournament, she’s defeated off-screen in the first round, in stark contrast to her making the finals in doubles.

    Introduced in Mario Tennis Aces 

Lucien

A powerful tennis racket, and an ancient relic of the Kingdom of Bask. Its corrupting influence caused the ancient king of Bask to seal it away, but its power is reawoken by Wario and Waluigi, sparking the main conflict in Aces.
  • Big Bad: Of Aces. It has taken control of Wario, Waluigi, Luigi and finally Bowser in its plot to take over the world.
  • The Corrupter: It can take control and corrupt all those who possess it.
  • Demonic Possession: At the very start of the game, it takes over Wario, Waluigi, and Luigi with the grip tape on its handle.
  • Eldritch Abomination: Appears to be an ordinary if not fancy-looking tennis racket, but in reality is a demonic force.
  • It Can Think: Lucien seeks out willing participants to control, and corrupts them to do its bidding.
  • Living MacGuffin: A tennis racket with a mind of its own, and it seeks world domination.

Aster

The adviser to the king of Bask. Now a spirit within the kingdom's ruins, it encourages Mario to retrieve the racket that has been released.
  • Big Good: The polar opposite of Lucien, who helps guide Mario in his quest to stop him.
  • Spirit Advisor: Long gone before the events of the game, only talking to Mario as a disembodied voice.
  • Super-Empowering: He passes his power to Mario so he can use the Special Shot. Same for Peach and Daisy during the Lucien Cup.

Madame Mirage

The boss of Mirage Mansion, and the guardian of the second Power Gem.
  • God Save Us from the Queen!: Her mission title is "All Hail the Mirror Queen", and she fully admits she wants to show Mario how terrifying she is.
  • King Mook: While there were plenty of mirrors throughout the mansion as obstacles, this one you have to fight directly as a boss.
  • Magic Mirror: A giant mirror who uses two smaller ones to reflect the ball.
  • Mind over Matter: In between phases, she uses her power to throw objects from the mansion at Mario to hurt him.
  • Noblewoman's Laugh: She does this to taunt you if you miss a ball.

Snow Ogre

The boss of Snowfall Mountain, encounted at the summit where the third Power Gem is located.
  • Attack Its Weak Point: See those giant eyes? Guess where you need to aim the Special Shot.
  • Combat Pragmatist: One of the unoccupied hands helps to support the other, whether by trying to crush Mario while volleying the ball, or blocking the downed hand from being hit by the Special Shot.
  • Expy: It's pretty much a carbon copy of Eyerok, only with a snow theme instead of stone. Another difference separating the two is the Ogre's eyes are on the back of the hands, as opposed to Eyerok's being on the palms.
  • Finger Wag: Both hands taunt Mario this way if you miss a ball.
  • An Ice Person: Produces large ice blocks to attack Mario in between phases.
  • Our Ogres Are Hungrier: Be honest: have you seen a giant pair of disembodied hands be called an "ogre" before?

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