Splatoon is a series which lends itself to irresistible merchandising opportunities, be they cute plush toys or themed towels. However, one line of toys which has done very well so far is the range of official Splatoon water pistols; released alongside the first game, this was a promotional match made in heaven - after all, the characters in the game are shooting liquid (oo-er) all over the place, so why not give us humans the chance as well?
They look just like the real thing! Hopefully we'll get these in the west at some point.
Thanks to eigotaku for the tip!