Although he has a tough exterior and is cold towards others, there is a softer side to Kaidoh. Unknown to many, Kaidou enjoys playing with small animals. He is often seen playing (or at least trying to play) with Ryoma's cat, Karupin, who wanders off on his own most of the time. Koharu notes that Kaido was often mistaken for a girl back in Kindergarten and was sometimes forced to wear a skirt, crying a lot as a result, implying that Kaido's tough demeanor is merely a front to hide his insecurities. This hidden vulnerability often puts Kaidou in many comedic situations as he tends to take himself way too seriously compared to his peers.