Which composer is K.K. Slider based on in the Animal Crossing series?

K.K. Slider is based on Nintendo composer Kazumi Totaka.

The connection is built into the character's Japanese name, Totakeke, which is commonly understood as a rearrangement of “Totaka K.” K.K. Slider is also portrayed as an animal caricature of Totaka. Totaka has worked for Nintendo since 1990 and has contributed music, sound direction, and voice performances across many of the company's games.

K.K. Slider debuted in the original Animal Crossing-era title and became the series' traveling musician. In most games, he performs songs for villagers and the player, then provides a recording that can be played in a home music player. In New Leaf, he also appeared as the DJ character DJ K.K.; in New Horizons, he performs concerts after the player's island reaches the required development milestone.

The other options are Nintendo composers associated with important game music, but they are not the person K.K. Slider represents. Totaka also voices the character, further strengthening the identification.