Since 2009 you can find Harinezumi ingame in HKO in the Musée Du Louvre in Paris. It's close to the south entrance to Paris, where Bagel (in Paris) and Scone (in Paris) are. The door isn't locked - just walk right in!
He will need your help to do some carpentry, so check him out before you leave Paris. Harinezumi appeared in the TV-anime-series "Onegai My Melody" and if you search for a while you may still be able to get a rare bushy blue Harinezumi-hedgehog-plushie to buy somewhere.
Quest(s) in 2008: