Hokuto Kaga

Hokuto Kaga is a friend of Hinagiku's who runs a small cafe called Café Donguri. Hinagiku helps out there occasionally, and at one point, Hayate, Nagi, and Ayumu work there part-time. He also appears to help run Sakuya's maid cafe, Himawari.

(Source: Hayate no Gotoku! Wikia)