Balk

Balk is a Flexers Mixel.

Description
All that head-butting has bashed Balk's brain-cells, so this hammer-headed Mixel can be forgetful and find it hard to spit out the right words. But there's no one better to defend the Rubber Lands, where the Flexers live, from Nixel invasions.

Nixel Mix Over
Balk and Lunk were going to play "Slingshot". Balk called the painted Nixels "little Mixels". He asked if they wanted to join them.

Elevator
It is his birthday in this episode, and most of the Mixels (the only one who doesn't is Flain) attend his party. He appears at the end when the Lunk and Tentro mix crash into the cake, just as he is about to blow the candles and make a wish.