When Li moved to Tomoeda and first started helping Sakura collect the cards, he and Kero did not get along. Kero was mad because Li called him a stuffed animal. Kero then bit Li's finger! One time, they switched bodies, and that was a nightmare! Sakura is frequently having to referee fights between these two. Even though they don't get along, both characters will do whatever it takes to protect Sakura and the Cards. Even if it means putting aside their differences for a while.