Kinda weird but I thought it might be neat

sentinel prime

First time I actually know watcha talking about Transformers related and agree with it

GENIUS

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AU idea: Bloodfiend Collector

Either the Crystal rejects him because he tries to enslave humanity or Collector rejects the other Bloodfiends and fights against them

I think the latter would be more likely

Consider bloodfiends, or at least most of them, are born through transformation.
So this would likely be before he got the crystal.

I doubt he would go against other bloodfiends, once a bloodfiend, you're tied with blood. You become family, so betrayal is almost impossible.

If it was before he got the Crystal he'd just be a normal bloodfiend, if he was his current self with the Crystal, it wouldn't be hard for him to betray the bloodfiends considering his tendency to not get attached too much to other people, and just generally being a little cold sometimes

Does blud understand that bloodfiends become HARDCODED to each other?
Even the most vile bloodfiend hunter would be attached to bloodfiends once transformed

Collector will still kill those he is attached to if it's for the greater good

If he can suppress his instincts tho

Considering he's thousands of years old and has spent basically all of it fighting and training, yeah he probably could