Pain

Pain, also known as the Driver of Agony is a large blue colored mechanical Demon that can switch between a coffin-like appearance and a vaguely humanoid one. Pain is said to have been born from torture device that became sentient and reincarnated in Inferno. Pain is said to feed on the feeling of injury and hurt and tend to appear anywhere conflicts created by these emotions are happening.

Bayonetta 2
Pain serves as the basic large enemy of Inferno in the same way Beloved is for Paradiso. Pain is often accompanied by groups of Hideous and Hatred that are here to assist him by keeping Bayonetta busy. Pain first appears as a mini boss in Chapter V.

Lemegeton's Guidebook
"A powerful tank that would trample angels with bloodstained iron wheels and drag them into a world of nightmares during wars with Paradiso. According to Vigrid legend, Pain's wheels were used for torture, until becoming sentient themselves and reincarnating in Inferno. Similar to how those of strong faith are said to have rare encounters with angels, humans harboring strong feelings of doubt are more susceptible to finding themselves face-to-face with a demon. Like his name, Pain is said to feed on the subconscious feelings of injury and hurt in one's soul and will appear anywhere people misguidedly attack each other in an effort to obscure their own sense of loss and loneliness."