Seems like this group is ok with AI generated content, so I put my character description in and this is what came out:

... which is WAY more aggressive and sinister than I want 😂, so...
Went with the one in my character avatar scavenged from the Internet.
M8-T ("Matey") is a IG-100 ("Magnaguard") model droid, popularized by the Trade Federation as personal security detail droids.
Maybe he first came in contact with our Skip Tracer (?), working a mutual bounty job (Skip, a free lance contractor, M8-T as a representative of the party issuing the bounty?). Directed to work together.
Maybe things went south for the job, M8-T was all but destroyed while protecting Skip from an attack?
The issuer of the bounty didn't even think to ask for what was left of the droid back. But since he helped protect Skip, Skip had him repaired. And they've worked together ever since.
Something like that sound workable to you, @Kier01 ?
Or if someone else likes that story thread, I feel like something similar could work for just about any or all of the party.