According to the Nico stream:
September 1, 2017
Sephiroth 5★-6★
- Chain attacker.
- Will have skills that chain with both Orlandeau's Holy Explosion (Divine Ruination in GL) and OK's Onion Slice.
- LB: AoE Damage that lowers light and dark by a lot.
- TM: [Katana] Masamune. Will have a very high attack stat.
- Sephiroth should be fine as either a DW or TDH user.
Overall sounds broken af, befitting of the whale bait that is Sephiroth.