Monstro is a carefully hand-crafted all-caps typeface with different lettershapes on upper- and lower-case slots. When working inside OpenType savvy applications, the contextual alternates feature can take care of alternating the glyphs, thus preventing double letters from displaying the same glyph (and bringing more spontaneity to your designs). There is also an extra set of stylistic alternates: just turn on the stylistic alternates feature or pick the glyphs manually via some glyphs palette.
Monstro comes in 2 cuts: sketchy and solid, both hand-drawn. And yet there is the lovely matching picture font that brings a big bunch of irresistible monsters and other cool graphic elements.
Sans-serif and bold, useful and friendly, these fonts are quite perfect for a monsterful of purposes. I can tell that you are gonna be friends!