You can pick whatever model you want, but only one.
You can pick it's gadgets, color scheme, voice (Beeps, chirps, etc. or an actual voice), its level of intelligence, almost everything.
It can be a servant, a friend, whatever.
I myself am not sure.
I'm unsure between a BB unit, a BD unit and a Super Battle Droid.
Which would you pick?
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C1-10P I just know he’d be loyal till the end and isn’t afraid to open an airlock on some stormtroopers. He’s also witty and has a great humor. Great droid all around.