Quiche is one of, if not the most important antagonist in the series.
Quiche is the first of the aliens to come to earth along with Pie Ikisatashi, and Tart Ikisatashi. His people were originally from Earth, and were forced to flee their planet. He hates humans for turning Earth into a trash heap so he, Tart, and Pai use Chimera animals to destroy the human race.
He thinks Ichigo is the cutest of all of the Tokyo Mew Mew girls and even calls her "Kitty cat." He would do anything to gain Ichigo's love. He even tried several times to kill her crush, Masaya Aoyama, out of his jealousy that Ichigo liked Masaya more. He has tried many times but has never gained her love. He even tries to kill her when he was rejected.
Kish enjoys torturing others and thinks of his enemies as "toys." He is also very possessive. He has a short-temper and is hard to control when he is angry. He would even attack one of his teammates out of sheer annoyance.
He died protecting Ichigo and later comes back to life, thanks to her.