Probably from Wales, although depending on where in the principality he lived, the accent may be quite interesting, and while British, certainly not most people

Probably from Wales, although depending on where in the principality he lived, the accent may be quite interesting, and while British, certainly not most people's stereotypical idea of a British accent. If he lived in Whales, then (if Octonauts is to be believed) the accent could be Texan (Bowhead Whales), English RP (Orca Whales or Sperm Whales), stereotypical Slavic accented English (Narwhals)