This wierdo of a navi is also one of the four new Darkloids introduced after Dark Rockman's debut. He's also the weakest of the four, deleted in the episode right after his first appearance.

He and Cloudman were dispatched to destroy Rockman specifically, but they chose a time when Netto and Rockman were surrounded by every single one of their friends. This dumb move cost Blizzardman his life, and allowed Cloudman only a narrow escape.

Blizzardman was the most adorable of the new four. ;_; and he was the first to go!
This character description was made for episodes that I have seen so far. It may be updated as more episodes become available.