What does a standard team using those three look like? I have Liu Bei but I haven't started working on him yet.
uh probably just
Athena leads, GZL (GXZL leads if you need even more damage), Liu Bei, and then two more attackers of whoever the fuck you want. Athena + GZL + Liu is already the perfect combo of orb change + enhance + multiplier for melting everything so the last two can either be utility like bind breakers or just more green attackers. Most optimal is probably like 2 more Liu Beis though :V
other stuff that can work:
Susanoo is great especially for GZL since you can tank hits to activate his leader skill and he even has TPA
Sasuke for a low cd orb changer
Marine Rider as a worse version of Liu Bei
Zhang Fei is nice and farmable but you do need to skill him up a bit
Thumbelina can heal, clear binds, and even has tpa
Wonder Woman who would be actually really good except no TPA thanks gungho >_>
Shu has nice awakenings
Echidna because why the fuck not
Isis cause she's da bes