All the characters are interesting...
X-0DUS is the clear #1
Vortex 4* that we've been waiting for.
I think
Klawz will be underrated. While overall she's a little weaker than
Leviatonn, she is strong against the toughest matchups- she's very competitive against All- Stars and
Piranas. This is a solid #2 or #3 3* option for
GHEIST.
Lena is a playable 5* character. I've found Protection: Power + Damage to be a useful and underrated ability. She compares directly with
Fixit.
Fixit is better with bonus, but
Lena is better without bonus. But Pcats probably need to use a 5* that will hit harder so she probably wont get used over
Ditha. She compares poorly with 4*
Yayoi in T1. I like her better than
Diana but I'm not sure if she's a 1* upgrade over
Diana. She's close though.
Darril is better than any of the 2* damage = damage characters we've seen before. He breaks even with most other 2*s if you can get +2 damage out of him and looks very good if you can get +3 or more damage (against a base 4 damage character). That said, the chance of that is bad, and
Berzerk has so many wonderful options at 3* that it's very rare you'll use him instead of trading up for a 3*.