Golgo 13

Golgo 13, also known as Duke Togo (Japanese: デューク・東郷 Hepburn: De~yūku Tōgō), is the titular character of the manga series of the same name created by Takao Saito. An assassin for hire, Golgo accepts jobs from various organizations & individuals. He is known for - among other things - his cold, calculating attitude, superb marksmanship skills & prowess with women.

Golgo appeared on an anime crossover Golgo 13 x Hamtaro (ゴルゴ13×とっとこハム太郎 Gorugo Sātīn x Tottoko Hamutarō) and its OVA and TV special counterparts.

Trivia

 * In some Golgo 13 crossovers, Golgo has a split personality. Sometimes he's cold-hearted, and sometimes he's a complete goofball. Especially when he's around cute characters.