>>543519084
Any trainee with the dominator skill as one of their potentials. It's a global speed debuff on all your opponent's racers as long as you are positioned towards the back late-race.

Pic related is what a barebones dominator build looks like, the concept is you pump wit as much as possible, all other stats don't really matter. You want to stack as many Hesitant X debuffs as you can, and if you have any spare skill points spend them on flustered X and subdued X skills.