Fen and Bonnie's current designs

Both are 3 heads tall (not counting hair/ears)

Minor tweaks on the way I draw Fen, so his face looks less square-y, etc

Improved their color palette, making their respective hues more balanced, avoiding contrasts:
Fen using green and yellow hues
Bonnie using red, orange and yellow hues

I've been designing them this way to visually represent their respective roles:

• Bonnie has the colors of fire, and small size

This suggests her fire powers and agility

• Fen has dark and bright greenish colors, also the physique of a not so tough yet pretty strong kind of guy
  

This suggests his malicious, greedy personality, and his strong grip and punching ability