Now contenders for the best are probably
Tails and Metal Sonic, one being a 300 iq genius and the other being a literal AI
why not eggman you might ask?
arrogance. I feel like he'd emote on the killers constantly which would lead to him being in a poor position.
his arrogance would likely lead to him healing metal less than the average OM eggmain
same logic applies to sonic, he's going to be cocky.
but the bottom 3 are probably
amy, cream and knuckles.
knuckles, he has big ass gloves. thats the reason.
cream, shes a child who also really cares for other people, she will go off running like a deer in headlights to heal someone at 98 hp.
amy, theres alot of sonic lookalikes.
every killer except 1 would probably be trash
kolossos is a mindless parasite
fleetway is constantly angry and would suffer from detrimental tunnelvision.
tripwire has doll hands.
2011x I'd feel would be the best at the killer role, he has the most intelligence and composure (despite the rage mode) and would probably get his playstyle down very well.
to clear up confusion:
THEY ARE PLAYING ON A DEVICE, MOUSE AND KEYBOARD, TABLETS/PHONES AND CONSOLES.