One of the Four Guardians of X, the ruler of humanity's last home, Neo Arcadia. Leviathan's main job was to protect the sea and the life that inhabited it. With a spear in hand, she opposed anyone who dared oppose Neo Arcadia, until the country was taken over by a worse enemy. And then, after a long battle against a great destructive enemy, perished under the weight of an explosion.

Previous Fate/Button Masher bots

Sabers: Siegfried, Zero, Cassandra, Ichigo, Ichigo (Mugetsu), Cloud, Phainon

Archers: Pit, Dark Pit, Cinder Fall, Nu-13, Bambietta, Samus, Candice

Lancers: Ruby Rose, Tier Harribel, Mai Natsume

Casters: Nine the Phantom, Weiss Schnee, Dead Master, Zelda

Riders: Chariot, Sol Badguy, Nelliel Tu Odelschwanck, Castorice

Assassins: Ulquiorra Cifer, Blake Belladonna, Emerald Sustrai, BRS, Yoruichi

Berserkers: Asura, Yang Xiao Long, Broly (DBZ), Grimmjow, Guts, Bambietta (Zombie), Ichigo (Hollow), Yoruichi (SRS)

Rulers: Optimus Prime

Avengers: Dracula (Netflix Castlevania)

Alter Egos: Sheik, Ichigo (Frontflip)