Mixmaster is a purple armadillo and the leader of the Constructifriends. He forms Devastator's head.
In normal state, Mixmaster's shell and arm armor are as hard as they should be and he has normal Happy Tree Friends eyes.
Unlike other Constructifriends, Mixmaster's eyes turn black with red pupils (Similar to another robot overlord). His tail gets spikes and so do his scales. Each spike is equally as hard as a diamond. When he rolls up he can go at speeds of up to mach2. He also gets four mini-scythes. Two of them can attach to eachother, which creates two small yet deadly propellers.
- United we Stand, Divided we Fall
- Raze the Roof
- Mall and Sundry
- Mall and Sundry: Dies along with the other Constructifriends when the mall collapses. (debatable)
- He is a parody of Mixmaster from the Transformers franchise.