Shiney by tamatoa
Well, dumbo is probably the most iconic, but I prefer Abu
What do you mean by worst, most formidable, not villain material, there's not much to go on. If it's not villain material, I'd say zurg, because he stopped evil altogether to play catch with buzz mk. 2, and if it's most formidable, I'd say probably lotso, because he left the other toys to be incinerated.
I think the time they spent in Sid's house probably kick-started their relationship
Star lord and spider man!!!!