Fake Jelly, or Arne as a companion, is a monster in the second part of Monster Girl Quest: Paradox.
Monsterpedia Entry
Attacks
Strategy
Evaluation
"You seem to have fully enjoyed the squishiness. Just like a jellyfish, you have no backbone... Fake Jelly is a monster that looks human. It will attack with Tentacle skills. Physical attacks barely graze her but Thunder magic is effective. Status ailments are hard to inflict on her. Now go, oh coward Luka. I only like fired chicken without the backbone."