The Old Man

A mysterious old man, the landlord of the Furai Row-House Block. He is always surrounded by a coterie of young women, and has many strange inventions inside his home. At one point, the Furai block is heavily damaged by a gigantic wood-and-ceramic mecha, and the Old Man repairs it by pulling a lever on his wheelchair, which causes the damaged buildings to retract into the ground and be replaced by new, undamaged ones. In Episode 10, he is revealed to be Gennai Hiraga, an actual historical figure thought to have died in 1780. On the final episode, it's shown that he is actually an alien with a space ship hidden under the row-house.