Character Development: Starts out as a fairly stereotypical Jerk Jock who is condescending toward Ethan and considers his sport more important than his ranger duties. By the end of the show, he is more compassionate, actually cares about the others and tries his best to help.
The McCoy: He's more impulsive than the other two.
Right Behind Me: In the season premiere he says that Principal Randall is just a woman and women are just grown-up girls, just in time for her to appear and catch him for ditching class to play soccer.
Four Is Death: He's the fourth Ranger on the team and is wearing his fourth color overall. Over the course of the series, he gets frozen in amber, hit with two different instances of Power Incontinence, and is briefly put in a coma.
He's Back: Happens twice, when he morphs for the first time, and later when he recovers from being in a coma with access to Super Dino Mode.
Living Legend: His reputation has surpassed Jason's, due to having been four colors (green, white, red, and black), and having been leader of three teams of rangers. Both in and out-of-universe, he is considered the "Greatest Ranger Ever" and for good reason.
Power Incontinence: Twice; the first time, he got stuck in his morphed form by the White Drago Ranger, and the other time, he got stuck in his invisible form.
Retired Badass: At first, though it's not long before he takes up a morpher once more.
Same Character, but Different: Entirely justified considering it has been six seasons since the last time we saw him (not counting Forever Red, where he was more or less similar to how he is in this show).
Seen It All: Tends to give off this vibe at times. Then again, he is considered by many to be the greatest Ranger in history for a reason.
Trent Fernandez-Mercer / White Drago Ranger | (Actor: Jeffrey Parazzo)
I know I've got a lot to make up for, but I promise - this time, I won't let you down.
Ascended Fanboy: He gets to meet a comic book artist he admires and the two even work on a comic together after Trent is forced to tell him he's the White Ranger (Anton bankrolls it without telling him).
Because You Were Nice to Me: Despite their differences, Trent has a strong attachment and an Undying Loyalty towards Anton because he adopted him and was the only one to care after he was orphaned. It comes to backfire him horribly after his teammates find out that Anton is Mesogog and Trent has been covering it all along.
Happily Adopted: Dr. Mercer took Trent in after his biological parents died at an archaeological dig. Their relationship may be strained most of the season, because of Mesogog, but they clearly care about each other and Trent still has no problem calling him "Dad".
Heel–Face Turn: Starts off being evil (against his will); ultimately turns back to the side of good.
Invisibility: His Dino Gem grants him a chameleon-esque form of camouflage.
Dark and Troubled Past: He used to work with Tommy on combining dino DNA with technology. The lab and island that they worked on was destroyed, but both Anton and Tommy survived. Anton, along with Tommy, resurface at Reefside. He was not pleased at all to see Tommy had survived.
Fantasy-Forbidding Father / Follow in My Footsteps: A point of contention between Dr. Mercer and Trent, as Mercer wants to groom Trent for the business world and thinks his drawing hobby and afterschool job at Hayley's are beneath him. In Mercer's defense, some of his lines suggest that he's preparing Trent to handle being on his own in case he loses his internal battle with Mesogog. In the finale, after he is freed from Mesogog's influence, he is much more supporting towards Trent's hobbies.
For Science!: Why he created the formula that turned him into Mesogog.
Jerkass: At first, especially towards Trent and Tommy, because he tries to keep the fact that he is Mesogog from them.
Jerk with a Heart of Gold: Once it's revealed what happened to him, he warms up toward Trent at exactly the same time that Trent discovers his secret, because he allows himself to let down his guard because he no longer has a secret to keep from him.
Professor Guinea Pig: He accidentally turned himself into Mesagog after experimenting a potion on himself.
Devin del Valle & Cassidy Cornell | (Actors: Tom Hern and Katrina Devine)
Aborted Arc: Early episodes showed Devin as slightly more competent than Cassidy as at the time he was to become the Sixth Ranger, but these plans were tossed aside when they realized the Triassic Ranger was just a Red Ranger power up.
The Baroness: Rosa Klebb personality, but she later attempts to pull of the Sexpot variety.
Brainwashed and Crazy: When she loses her powers, she looks much more human and acts as if emerging from a daze. She later claims to have been under Mesogog's control, and the Mesogog-free Anton is happy to see her.
Clark Kenting: Lampshaded; when her cover is blown, Tommy notices he should have guessed sooner and Ethan references the trope namer.
Good Scars, Evil Scars: A black, stitched scar runs from her bottom lip to her chin. Ironically, it acts quite a bit like a 'good' scar (vanishing when she transforms, not detracting from her looks, etc.), but marks her as a villain at the same time.
Papa Wolf: He inadvertently created a younger clone of himself named Goldenrod, who was determined to make his "father" proud of him by destroying Tommy. Zeltrax actually did grow to see him as a son, and once he was destroyed in battle, it made him hate Tommy more.
Rival Turned Evil: He and Tommy used to work together. After being rebuilt as Zeltrax, he blames Tommy for everything that went wrong in his life, including the accident that led to his transformation.
The Starscream: subverted; the White Ranger tries to conspire against Mesogog with him at some point. Zeltrax, however, immediately warns Mesogog about it. Played straight when he comes back.
One-Winged Angel: He gains a super powered form through the special underground spring that flowed beneath the Tree of Life.
Undying Loyalty: Toward Mesogog at first. Disappears after he got resurrected.