Netnu is a malevolent Beorn. He is widely considered the complete opposite of Unten, even to the point of having his name changed to a backwards version of him. His debut appearence was in Team Fanon, and he has appeared in several games since. Out of any given character in That One Series With a Long and Uninteresting Name That I Do Not Wish to Remember series, he is likely second to Unten in terms of how many backstories and alternate looks he's gained over the years.