Beam (ビーム Bīmu) is a Shark Fiend (サメの魔ま人じん Same no Majin) and a Public Safety Devil Hunter from Tokyo Special Division 4.
He is devoted to Chainsaw Man, always referring to him as "Lord Chainsaw" or "Master Chainsaw". Beam is very innocent and almost childlike, often getting excited about rain and water. As you turn the corner, being greeted by Beam was quite the surprise, though, once the fiend noticed you, excitement would fill him even more, eager to make a new friend.