I don't really know them, but I'll go through their abilities and decide on who wins, I guess...
AP - Regina via -
Multi-City Block level (
dispersed a cloud)
Striking Strength - Xue Ying via -
Multi-City Block Class
Stamina - Xue Ying via - Very High,
able to fight for several days with someone comparable to him
Range - Xue Ying via -
Extended with Spear, further with shock-waves,
Hundreds of Meters via throwing his spear, several Hundreds of Meters via Being One with Nature (telekinesis)
There's no direct energy value of Xue Ying's justification while Regina has an AP advantage by 2x the amount so that's not much of an advantage while Xue Ying should have a lot of advantages via having various amount of combat capability due to being a martial artist, so he'll be able to deal continuous damage just with his punches alone if he decides to go CQC, and it's not even taking into account his other abilities and his spear attacks
He can also attack her from afar via being One with the World, suppressing her mobility and nullifying her abilities while also having Regenerationn, so Regina really isn't doing that much damage on him, and it seems like her only potent moves are for in-character and unknown circumstances, so he pretty much has a lot of advantages.
Seems like she has Selfish Beam, which is probably Soul Manipulation, which says that it rips them out of their bodies. How in character does she use it often, she could probably kill him using that if it hits, but if he decides to play being One with the World, it won't be hitting him
How does Regina's Teleportation and Telekinesis work
I vote for Xue Ying for now
