ねりこ

"Well, that's rude. I'm Nelico, the glamorous, beautiful shopkeeper!"

A mysterious woman who runs the general store near Ion's home.
She groans about being bored at every opportunity, and will always tease Ion if she has the chance.
A happy-go-lucky free spirit, she hates dull things and trouble, basically passing such issues on to others.
She takes pride in her charming ears and in her drop-dead gorgeous body.

English official site

In reality, Nelico is a parasite attached to Ion's brain.