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I would like it to be Gabriel, but she seems like the hardest target because he could bring her fallen and if Asia wants to maintain her status she will probably have to keep her relationship with a woman a secret. It seems more likely to me that Xenobia and Irina are with Asia, if Asia comforts them after finding out about God's death and she becomes her spiritual pillar maybe it could be possible to form a relationship.
I remember that in the Gx manga, Jaden's Ace monster was "Elemental Hero Terra Firma", which could double his attack from 2,500 to 5,000, maybe you can give the MC "Magicians of Bonds and Unity", like his other Ace monster he has a "Terra Firma" similar effect so that his maso is not so similar to Yugi's.