My current RPG project is a game called Raspberry Heaven, and it's about heartwarming every day stuff with Japanese high school girls. It's heavily inspired by Azumanga Daioh, Lucky Star, Hidamari Sketch, and Ichigo Mashimaro, and for the game I decided to make some original characters that I could use in yon-koma strips to illustrate stuff about the game and just for fun.

Their "Quirks" (the main character trait in the game) are:

Rika: Boke, Nice, Lazy
Natsumi: Tsukkomi, Tsundere, Complex (Height)
Ayumu: Space Cadet, Genius, Delicate

These are just my first stab at character designs for them, and hopefully the final version that would appear in the game will be done by someone more talented than me.