Deady is the protagonist villain of the franchise of the same name, including a few online games and a comic book collection - he is a malevolent teddy bear with demonic powers and traits as well as a style that is a parody/homage to 30s cartoons.
Deady is the result of a Lovecraftian Horror from space merging with a harmless teddy bear, resulting in a horrific monster that while "cute and fuzzy" on the outside is a merciless killer on the inside and an outright villain to boot.
Unsurprisingly one of Deady's promotional games involves an Evil Vs. Evil scenario in which the sociopathic teddy bear goes on a murderous rampage of revenge against another Dark Lord - all played to the tune of "When You're Evil".
Outside his role as a villain he is also somewhat of a mascot for Voltaire, who created the little terror with the aid of several guest artists - he also teamed up with the creators of AdventureQuest to help get Deady his own game as well as a spot as a cameo-guest in Adventure Quest related products.