TLDR: HEAVY WILL CRUSH YOUR OC LIKE BUG!
Here's an idea for a "let me draw your OC" type thread. Basically it's a first person perspective of Heavy Weapons Guy from Team Fortress 2 interacting with whatever OC is posted.
Beforehand, you make base images of Heavy offering someone a sandvich, petting something, firing his minigun, holding up his dukes like a boxer, holding the Pyro like a mini gun while he fires his flamethrower, and strangling something with one hand. Each OC would will be drawn into a copy of one of these base images.
Sandwich: Human children and harmless human women.
Pets: Sweet little creatures.
Boxer: Someone his own size.
Minigun: Competent fighters or whatever would be difficult to strangle or burn.
Pyro: Unholy/fetish-fuel or something Heavy wouldn't want to otherwise touch.
Strangle: Everything else (consider using this for competent fighters instead of minigun as well)
If you end up using strangle almost exclusively consider putting them together choreographed to Broady Quest.