Answer to the title: Yes & no. I'd be lying through my bloody teeth if I said no. I don't let the tier list (the non-exsistant tier list of Brawl) decide who I play, but it helps whenever my favorite character is depicted on the teir list at a nice rank.
Pit: Generally accepted as at the least a High tier character. But I play Pit cause I wanted this **** character since before Melee, after SSB64. Finding out that Jiggly-f*ck*ng-puff replaced Pit in 64 pissed me off to no ends, and Pit (as well as Joanna Dark, Banjo & Kazooie, King Dedede, and Meta Knight) were my must-have wanted characters for Melee. None of them made it into Melee, and I was initially fine at 1st, until I unlocked that Pit trophy in Melee. Like how people wanted Ganondorf to have his sword for Brawl, only to see him pull it out for a taunt, and how people wanted to play with Isaac in Brawl, only for him to get turned into a mere Assist Trophy, seeing that Pit Trophy instead of a playable Pit really pissed me off. I knew, now matter how Pit played, I was maining the f*ck outta Pit come Brawl, hell, and highwater.
Wolf: Generally accepted that all three Star Fox characters rank in the High tier, with Wolf below Fox and Falco. I'm no true StarFox fan, and if I was, Fox McCloud would probably be my favorite StarFox character, but I love wolves, werewolves, wolf-like dogs, etc., and Wolf O'Donnell is a wolf. So I'm secondary maining him. That's all.
Lucario: I have no idea where it ranks. I'm told Middle tier, but above the likes of Luigi, below Kirby. That about right? Anyway, before Brawl, before even Pokémon Diamond & Pearl (the 4th Generation), when I 1st saw the preview art for Lucario, I knew it would be my new, and forever, favorite Pokémon of all tme. My favorite type is Fighting-type. I knew Lucario wouldn't be a Legendary, despite its role in that movie and despite everyone's predictions. Diamond & Pearl proved me right. Not since Pit had I wanted a character soo **** badly in Brawl. My friends IRL can contest...anytime Bralw came up in conversations, all I talked about was: Lucario. Lucario's possible moveset. Lucario better be in Brawl (playable) or else. So now, I'm playing my favorite Pokémon in Brawl. To all those who didn't want Lucario in Brawl...suck it!
Meta Knight: Sorry, no over-the-top story here for the other Top tier character (Snake being the 1st), the one that I happen to use. I kept trying to force my best bud to main Meta Knight for months before the game even came out in Japan so we could have epic Pit vs. MK battles, and he wouldn't take. So months after the game was released, and he still wouldn't main MK, I decided to, and now, he's one of my secondaries.
Anyway, I have stories that go far past teir-lists for why I play who I play.