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.
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.
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.
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".
Ship Tease: Has some of this with Kira. However, since the series focuses more on Trent's strained relationship with his father Anton, this is not further developed and by the finale they end up as Just Friends.
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.
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.
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.