The Anubis-Hades and Hades-Poseidon thing is def gonna be interesting. Dunno who I see as leading the team, but just in terms of personality

Hades is the Rock, he's the calmest and steadiest of the crew
Anubis has no personality filled in, not in the char division of the topic, so can't judge him
Poseidon is the Enforcer, normally calm but powerful and angry when the situation demands
Nezha is the Heart, he's youthful, kind, and innocent but with unwavering ideals and codes.