Dont know who to level up now

I AM AT A POINT WHERE I DONT KNOW WHO TO LEVEL UP.
HERE ARE MY TEAMS AT THE MOMENT. ANY SUGGESTIONS ON WHO TO MOVE TO MY MAIN TEAM? ONATEL HAS NOT BEEN WORKING OUT FOR ME.

T1T2
T3T4
T5T7

How do you get so many Level 5 characters?

Id say Wu Kong, Boldusk and Tiburtus.

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