Decks like Sai, Master Thopterist, Lonis, Cryptozoologist, Tameshi, Reality Architect, and other artifact-centric decks all make great homes for Kappa Cannoneer
It has everything to do with FFIX lore, and also creates an interesting game state - you'll deal damage constantly and probably win before you know it
The younger Vendrell child may have brought about the creation of the entire plane of Duskmourn by making a pact with a moth-shaped demon, but who among us hasnt made a few mistakes in our youth
All the others need you to have survive a turn or fulfil criteria on the board to be cards up right away
6/6 with flying and trample for 6-mana, and it's got a massive bonus of forcing opponents to sacrifice permanents if they don't let you draw two cards