Finn

Finn has no active ability at all, and that is deliberate: his whole kit is a passive burst of speed. Reel In gives a 35% Movement Speed boost for 10 seconds whenever any machine is completed, a larger bonus than the 25% Shelly's Problem Solver offers for the same trigger. Stats are modest, with Skill Check 4 as the high point (a 200 unit window), Movement Speed 3, Stealth 3, Extraction Speed 3, and a weak Stamina of 2 that makes the speed burst worth using on short trips. He fits a team that finishes machines in waves, so everyone gets a burst to reach the next one. Cost is among the lowest: 500 Ichor and finishing 15 Machines, a requirement you will reach in your first couple of runs. That makes him one of the cheapest ways to get a Toon with a distinct mechanic. His Twisted is Uncommon and its trinket, Fishing Rod, highlights all Machine locations for 5 seconds when a new Floor arrives, which pairs well with a Toon that rewards running between machines.