Turtle Shell, A
The turtle shell radical and the turtle shell kanji are exactly the same! Oddly, this can also be used to talk about the first item in a list, so to mean A out of A through D, for example.
Cowabunga! You get an A!
こう, かん
か
None
With a turtle shell on his back, imagine こういち.
Because this is WaniKani, こういち has probably set the turtle shell on fire, too. "Burn those turtle shells, burn those kanji!" he yells.