Mello (Mihael Keehl) is a character from the manga and anime series Death Note, introduced as one of L's two successors to catch the serial killer Kira. He is a genius who refuses to work with his rival, Near, and instead joins the mafia to pursue Kira, using ruthless and unconventional methods, and ultimately plays a crucial role in Kira's defeat.
This specific scene of mellow in the OP has famously been used as meme material since its release.
