My best advice for pull what you want without having too buy a fuckton of em.
As they're packaged
You can pop them out of the plastic they're in while the packaging and just feel for it
For example Torb would feel smaller, and has a large lip
Soldier and Tracer would be lighter in weight
You can feel the hairpin on mei
Etc etc
Pulled rein is the easiest, he's the heaviest and you can feel his helmet points