|Occupation||Mushi's and Kuki (Numbuh 3)'s father|
|Cameos|| Operation: C.A.K.E.D.-F.O.U.R.|
He regrets getting his daughters rainbow monkey dolls, because he does not want them to be always bickering. Mr. Sanban is known to lose his temper very easily, and prefers cold climates during the summer, as seen in Operation: H.O.T.S.T.U.F.F., where he has the thermostat in his home turned down to a freezing temperature and angrily refuses to allow it to be turned up any higher.
When his daughter Kuki turns up the thermostat so high that the house it literally flooded with lava, Mr. Sanban stays in the Sector V Treehouse while the Kids Next Door return his home to normal, with Numbuh 4 keeping an eye on him.
After they have done so, it is revealed that Mr. Sanban has tempered with the thermostat in the treehouse and frozen it. Numbuh 2 seems to be able to tame him. He has made Kani cry in Operation: C.L.U.E.S. and shushed him in Operation: S.P.A.N.K.E.N.S.T.I.N.E..
- His name is Japanese for "crab" (蟹), and reflects his crabby personality.
- His preference for cold climates may be due to the fact that in Japan, most housing units don't have central heating.
- As Numbuh 4 keeps an eye on him in Operation: H.O.T.S.T.U.F.F., many fans speculated that Kani will soon be Numbuh 4's father-in-law, as the video clip implies.
- This is basically confirmed in Operation: INTERVIEWS, since it turns out that Numbuhs 3 and 4 end up getting married as adults.