Old anime, watched it 3 years ago, somehow love Kisshu despite him being a bit of a creepy yandere.

Upon a closer scan, the character on the right looks like mew mew from anime and Undertale.

Wait I just saw something below this post about Tokyo mew mew

This is Tokyo Mew Mew

Exactly.

The translators somehow never figure out that his name is supposed to be Quiche.

I know his name is actually Quiche. I just say Kisshu because that’s how you pronounce quiche in Japanese