Honjou Mika

Japanese name:

本城 ミカ

She is Tazusa's quiet best friend and the designer of all of her skating outfits. A running gag in the anime consists of Tazusa yelling at Pete who is invisible to other people only to have Mika mistake the target of Tazusa's tirade as herself. Mika's voice actor also sings the ending theme of the anime series.

Wikipedia