(Well, I just want to preface this answer with the deal of the "different ichikas" are kept very vague on purpose. I'll only be talking about them on a surface level here.

🎸 - Ichika. The one you know.
☄️- Black suit, or KTF. Misguided.
🎭 - Grey hoodie, or PH. Angry.
🏹 - White polo or WD. Spiteful.

That's the most information I can give in view of public eye before I start feeling uncomfortable. If you wanted an in-depth answer, sorry-not-sorry.)