Vergil UMVC3 combo: 881,400 damage, medium. You can keep doing these loops until you run out of meter. If you're not in the corner, replace the Round Trip…
2L > 2M > H > 6H > 623L ( Hold L ) > H (Teleport) > Superjump 29M > M > H > S > 2H > 6H > Delay Release L > 2H > 236L > 2H > 623 ( L+M+H ) (Hold L During Super Freeze) > 623M Delay Release L > 2H > 236L > 2H > 623 ( L+M+H ) (Hold L During Super Freeze) > 623M Delay Release L > 2H > 236L > 2H > 623M > 3H
You can keep doing these loops until you run out of meter. If you're not in the corner, replace the Round Trip extension by just doing 6H into 214M. You can omit the 2H before Spiral Swords if you find you're dropping the combo for a marginal loss in damage.