Tick-Tock

(Comes at max level)

Valentine's Return Gift from Mephistopheles.
Increase Caster Coin Choco drops by 2.
[Revival: Valentine's Event 2018 Lite Only]

Valentine's return gift from Mephistopheles.

Tick-Tock, Chaldea's mascot.
This was Mephistopheles's grand scheme to take the mantle of the mascot away from Fou.

Unfortunately, it's not as popular because it explodes whenever it is jostled.
That seems strange to both Mephistopheles and Nursery Rhyme.