Quoted By:
Blue/Green/Whatever the fuck you prefer: Standard douche who tries to get the one up on you, still fails to do so.
Silver: Angsty kid who talks shit and gets hit, repeat process til he thinks he's the strongest
Wally: Only battle twice, doesn't care to become strongest but enough to give him more worth
Brendan/May: No comment, they're quitters half way through
Barry: Gottagofast, annoying at first but matures up and wants to be as good as his old man
Cheren: Another wants to be stronger type and thinks just because you have the same amount of badges you're both evenly matched
Bianca: More about the journey
Hugh: Constantly there with his rage which was annoying but different goal was different in a good way.
Gen 6: No comment, they all a shit.
My vote goes to Brendan/May for just the pestering with no challenge and quitting half way through the game.