Thank you for the responses, kind gentlemen!
I actually already created six - three above, plus Rin, Kotori and Yumemi.
Unfortunately I left it at my workplace, and since I'm not working at weekend I'll post the rest at Monday after several tweaking.
I... It wasn't on purpose, and I didn't notice... I tend to call her Uguu and it seemed I spontaneously wrote that instead of her name. I'll fix that later.
I made Rin light grey and Kotori pastel green. I'll try if light brown or mocha will suit for Rin's bg.
As for Yumemi, I went pastel yellow for some reason.
I'm more to "cover girl" heroines and I prefer Kotori than Kagari (lol sorry Kagarin)
I'll try making the Angel Beats! too but now I can't decide if it's gonna be Yurippe or Kanade.