Sissie

Sissie (シッシー) is a lake monster that was shown in the spin-off manga series known as, The Ways of a Monster Nation. It is known to reside in Lake Sis of the Great Forest of Jura.

Appearance
Sissie is shown to have the appearance of a large shark similar to a regular megalodon, with 2 semi-spiraling horns on the side of its head and features 3 rows of teeth.

Personality
Sissie tends to swim away from those with a powerful aura.

Trivia

 * Sissie, an analogy with Issie, said to be a Japanese lake monster in Lake Ikeda, on Kyushu Island.