Genre Blind: Chose to keep Natalie over Liz because Natalie was getting in good with the Galu tribe. He figured this would help Foa Foa tilt the numbers in its favor, and he was right, but he completely neglected how dangerous it made Natalie in the endgame.
Foil: Ended up being one to Russell Swan — the older, harder-working, capable leader taken out by his own work ethic, while Mick was the younger, lazier, incompetent leader who made it to the end of the game.
Out of Focus: Part of it is because the producers seemed to forget he was there (same with most of the Galu tribe), but he also blends into a crowd easily, so it can be easy to miss him until the end when the numbers start to dwindle. Shambo and Russell at least had distinctive appearances, and Jaison was large.
Standardized Leader: Subverted. He didn't do anything. This was savagely used against him in the Final Tribal Council. Considering that eight of the nine jurors were Galu, and their leader had been one of the most determined tribe leaders since Andrew Savage, they seemed to see Mick as a failure.
Supporting Leader: Being more of the "supporting" than the "leader" bit him hard in the end.
Beware the Quiet Ones: Spent the game as kind of a background tribe member, and when he wound up as the only original Galu member left, everyone else obviously plan to eliminate him. Then he wins three immunity challenges in a row.
Informed Ability: Zig-zagged. We're told by Probst he's not revealed a lot in the cast.
Irony: The first confessional of each Survivor season is often considered a sign that a contestant will be particularly memorable or likable. Brett, who was invisible until he came out of nowhere to go on an immunity streak, received such honor.
Kid Hero: Brett was 23 at the time and was the second youngest contestant overall.
Out of Focus: Several people had joked on boards about saying "Who's this 'Brett' guy they're talking about?" He did get some screentime at the end, though. In fact, Funny 115 made a page dedicated to how the editors suddenly realized that there was someone called "Brett" in the game.
Photoshopping him into screencaps of other seasons also became a Running Gag on the Funny 115.
The Quiet One: Normally you don't see these people cast on these sorts of shows because there's making an interesting show and an interesting game. What makes a good show doesn't always make a good game, and vice versa. And to be honest; look how far it got him. He was literally the last Galu member to be eliminated... and the last to even be targeted, for that matter. Having immunity runs certainly didn't help, either.
Spear Counterpart: To Ashley Underwood a few seasons later. Both were victims of a Creator's Pet ravaging the screentime, both remained silent and made the person(s) in charge of the game think they were worthless and saved them for last. Both then start going on challenge runs.
Thanatos Gambit: According to interviews, he actually sat down with Natalie before they went to Tribal Council when he was eliminated and worked on her strategy in front of the jury with her.
Rewarded as a Traitor Deserves: Flipped to Russell's alliance and more or less was the final nail in the Galu coffin. When it comes to just his five and Brett... and Brett becomes immune to the vote... three guesses who the first to go is. The first two don't count.
"The Reason You Suck" Speech: One of the more memorable ones of the series - he calls out Mick on his lack of leadership, Russell on his gameplay, and tells Natalie that despite others assertions, she's just as dangerous as either of the aforementioned and deserves recognition.
Running Gag: A recurring visual of the season is that most of Erik's confessionals were either delivered in a tree or very close to one or more trees.
Foil: Ended up being one to Mick - the younger, lazier, incompetent leader who made it to the end of the game, while Russell was the older, harder-working, capable leader taken out by his own work ethic.
Non-Gameplay Elimination: Had the record for the earliest - Episode two until Kourtney Moon's evacuation in One World in the first episode. According to him, this turned out to be for the better because he lost around 60+ pounds. (While not obese)
Worthy Opponent: Russell Hantz said that he had her eliminated first because she could have beaten him. (Though the fact that she almost immediately expressed mistrust of him might have also had something to do with it...)