Worlds that would have been visited until this volume- GoT, ATLA, Cyberpunk, BNHA, maybe Harry Potter. 

I will try to avoid spoilers as this is only a draft I will write because my hands are itching to try a Young Justice fanfic.

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There will be no romance if the MC sees no benefit it romancing a girl. 

His main focus will be becoming stronger, be it through magic , technology or genetic engineering.

He will have vast knowledge stolen from the Cyberpunk world. The bending he learned in ATLA will be unusable until he kills some elementals. Gods are real in DC so he can't eat souls willy-nilly.

All in all, I think it will be a fun ride. If you want a comparison, check out only the Renegade options in the With This Ring DC fanfiction.