Base of operations:
Kokmar, a small village in the bottom of a fjord, somewhere in the North.
Sepadeffasson is the scheming Viking who wants to be the new king instead of King Harald.
Hultrasson le Viking
Journal de Spirou #1351 (1964)
Country of origin:
Like Iznogoud wanted to be Caliph instead of the Caliph, Sepadeffasson wanted to be the king, and like Iznogoud's plans always backfiring, so did Sepadeffasson's. The name Sepadeffasson is a pun as it pronounced like c'est pas de façon
which is French for it is not so