Violet posted our own 'role call' in our journey thread, but here's a short-form version of all the parts we know:
Anger : no age, no gender, just rage.
Arin : 6yo girl, trauma holder, fear.
Charlie : 6yo boy, inside protector, former persecutor/bully.
Claire : infant or 20yo girl, trauma holder, depression.
Ewan : formerly a 4yo boy, trauma holder, abandonment.
Janet : unknown age, little, possibly first host, very good at hiding.
L---- : 14yo girl, sorceress or something, maybe not human. Powerful.
Maddie : middle-aged woman, maybe twin of Anger. Self-harm / self-mediate.
Melissa : 7yo girl, very active little, active front-person, clever & surprising.
Mike : 35yo man, outside protector.
Rebecca : ageless, emotionless, sometime ISH & maybe gatekeeper. Watcher.
Steph-2 : 32yo woman, mature, responsible, but lots of denial & anger about DID.
Viola : 17yo catgirl, occasional front-person. Possibly mischevious.

Violet-1 : 22yo woman, interim / shortterm host. Health / fitness / diet.
Violet-2 : 16yo girl, most-active front-person. Likes music & socializing.
For the full details, see here: The Flux System - as of 2018.10.14
Viola