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This article covers incidental characters in the Love Hina manga series.
Keisuke
Keisuke Urashima, Granny Hina's father and great-grandfather to Keitaro and Haruka. Keisuke had promised to fix Moé-chan, a Tsukumogami (tool or doll that has been cared for for 99 years and comes to life in its 100th year). Unfortunately, he has a poor memory like his great-grandson Keitaro, and eventually forgot about Moé-chan.
Old Men about Town
These three old men were believed to be the ancestors of the Urashima family, aside from Keisuke. They appeared somewhere in the first episode, where they sort of "toyed" with Keitaro's sketchpad, accidentally letting it land near Shinobu Maehara, the grieving girl who has run away from home due to domestic turmoil.
They never made another appearance as the series progressed.