Karin is a grumpy girl, as demonstrated by her when Jin came to the base. Not much of her personality was shown in the manga, but in the anime she was shown to be annoyed by Jin.

Karin is the Operator of Katagiri Squad.

In 3rd Season she narrates Tamakoma Second's four way Rank War during Round 7 against Azuma, Kageura and Suzunari squads.