Komaru, just like her brother Makoto, is someone very cheerful, optimistic and kind, but just like him, she has a low view of herself, thinking she is boring and uninteresting. She's also very sensitive, which led her to act cowardly, but is getting braver thanks to Toko and seeks to help. For reasons unknown she's able to swallow things and people bigger than herself, and even digest them! But while she may swallow someone if annoyed or pressured, she usually only digests Monokumas.