These are simply ideas I am throwing out there for any character, Canon or original. If you control a canon character and an idea for them is on the list it is up to you if you want to explore that idea or not no pressure these are just thoughts to think about if perhaps you are stuck on what to do next.
Canon Characters
1.)Would Peter Pettigrew stay a death eater in this timeline? What if he discovers joining the dark Lord wasn't the smartest of plans? Would he change his mind?
-How would his friends Learn or react to the truth? would they ever trust him again.
2.) Severus Snape is still in love with Lily Potter would there strained relationship change for something better or worse? or is it simply forgotten.
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Original Characters
1.) You are a generally a normal wizard with a family, but you fear for their safety with the war. In your desperate need to keep them safe you agree to join the ranks of the deatheaters even if you know what they do it wrong.
2.) You are a Bartender and you were force to make your bar a "No muggleborns allowed" establishment to continue running. Your clientele has changed to pure blood purists and deatheaters. You pretend to go along with what they say and if you learn anything valuable you tell a friend with contacts in the order.
This is it for now, more to be added later also feel free to add your own.