There's a precedent for it to be a character in Marvel w Symbiotes. The K7 and M3 don't have a background as strongly fleshed out in Spawn and has arguably been retconned out. We'd need to see more info to commit to the background that was only pulled out from a few early on issues. We'd need to change appearances in the 47 issues along with the classification of other symbiotes items as well as decide on powers and how they're listed as other characters with items have a classification system for them. You can review Category:Power_Item where we'd need to change character template to give power to symbiote as opposed to Spawn. We've seen some issues where he had these powers without suit too so we can't really make an official ruling on that given how inconsistent this series has been. Right now, without enough information or commitment let's leave it as an item.