(望月 コタロウ, Mochizuki Kotarō
) is one of main characters of Black Blood Brothers
- Main article: Kotaro Mochizuki/Gallery
- As commented by Mimiko, he does not appear to be the brother of Jiro since he is not hurt by sunlight nor water, unlike Jiro.
- Kotaro's only friends were Sei's older sister the Dark Princess of the North and Grand Duke Bow-wow (a friendly grizzly bear).