Loki the accursed prince vs Ulquiorra and Grimmjow from Bleach
One piece has a new toy now so fuck it.
He has good feats too as of ch 1182. He is an ancient giant of elbaph that carries the legendary hammer Ragnir and can turn into a dragon. The hammer was said to be so heavy no one can lift it, including his brother Hadjrudin who launched a 10000 ton weight off island in Dressrosa. The hammer summons bolts of lightning that are at least dozens of kilometers in size. The hammer can also generate ice that is SAID to be unbreakable which has held true up until now. The dragon is kind of big I'd say about 5 km but if you wank it it could be at least 10 depending on the paneling cause its one piece. He's not a speed demon in any sense but his observation haki is pretty decent so he would have an idea of where both of his opponents are and he can jump dozens of kilometers high if that helps. He also tanked a 50km fall as a newborn baby so hes tough.
I think you guys know Ulquiorra and Grimmjow already they both fought Ichigo's mask form and Ulquiorra pretty much won.
Battle starts in open tundra so Loki can see them
Both fighters lack knowledge about one another before the fight starts
Loki sees both of them and doesn't get mogged by reiatsu durability (at least not just because he doesn't have reiatsu) he still can have issues with spiritual pressure and the like
Standard morals apply
R1 he fights Grimmjow at full health
R2 he fights Ulquiorra at full health