Is this avatar from an anime? If yes, please tell me the name of the cartoon. . .

HitmanReborn, a governess, is an animation about the mafia. The story revolves around the growth of Sawada Tsunayoshi, the leader of the 1st generation of Italian Mafia, and his family members. Sawada Tsunayoshi, the first generation descendant of Pongler, was a "loser" who could do nothing, but in order to cultivate him into a leader, the Italian killer Rebirth was entrusted by Vongola Nono to go to Japan and began to educate him. Kind-hearted and unwilling to hurt others, he didn't want to be a mafia leader at first, but in order not to put his companions in danger, he began to take responsibility and fight again and again and gradually grew into an excellent leader.

Belphegor

Balian member of the ninth generation assassination unit of Mafia vongola, with long blond hair, neat bangs and a crown on his head. Its biggest characteristics are sharp "hee hee" laughter and white and neat teeth. As far as combat effectiveness is concerned, it is the most talented and powerful in the Eight Company. Because he likes killing people, he volunteered to join the assassination force, and the killing method was cruel. He is known as the "Prince the Ripper".