Kerrigan’s elderly appearance makes him a natural to be cast in guardianship roles, but his moody disposition, which swings from gruff to kindly, means the tone of his appearance differs considerably from story to story. So while he has made a career out of playing protective father figures, they have come in a wide range of roles. Although he first appeared in The Tutelary God’s Fire (1950), it is his role as Cactus Sam‘s adoptive father Chad‘s longtime friend “Kerrigan”, in Mr. Cactus (1951-53) from which his stage name is derived. He also had a memorable role as the father of Rumiko, Astro’s first love, in the Astro Boy (1952-68) chapter “Sea Serpent Island” (1953). It is interesting to note that when this chapter was first serialized, the role or Rumiko’s father was played by Shunsaku Ban, who was cast to play his own, younger, look-alike brother – meaning he appeared in two separate roles in the same chapter. However later, when this chapter was collected in a tankōbon (standalone book), the role was played by Kerrigan instead. So, while Shunsaku Ban‘s busy work schedule may have had some impact on the decision, it demonstrates Tezuka’s confidence in Kerrigan that he offered him a role in which he’d previously cast one of his biggest Stars. Sharp-eyed readers will also spot Kerrigan as the King of Troy in the Phoenix [Shojo Club] (1956-57) chapter “Greece” (1956), and as a pirate among Captain Blood’s crew in Princess Knight [Nakayohsi] (1963-66), and in several other manga appearances. A spritely grandfather, Kerrigan can easily be spotted by the two “rabbit ear-like” tufts of white hair on either side of his otherwise bald head, and his large beard resembling dandelion fluff. (Source: Tezuka In English)