Man there's nothing more I hate then novels sharing one omniverse with another from the same author, I love the authors work so much but these random interactions with his other characters spoil everything.
I can't wait for your third series story. Can you make it a Percy Jackson/Invincible/Mortal Kombat universe or at least have those universes in them?
It would be so cool to see a demigod with the powers of a Viltrumite fight in the Mortal Kombat arena.