is a ninja boy that knows the Ninja art of leaf concealment. He lives in the Ninja Village and likes to train alongside his Pokémon. He speaks in a pseudo-archaic manner. He has two brothers that live in the village: his eldest brother and strongest combatant of the ninja village, with his Gekkouga and the number two of the ninja village, his brother Nihei and Fushigibana.
was watching Ash's Froakie
train in a forest near Shoyo City when he revealed himself camouflaged in front of a tree. His training showed Ash Ketchum
how helpful it could be when he defeated Ash's Froakie
in a battle. Clemont
commented that he'd never seen a Quick Attack
like the one Sanpei's Frogadier
was able to do. Sanpei
is quite proud of the attack as no one gets up after the attack which is very fast and powerful. Despite being rivals on the battlefield, Sanpei
was friendly enough to help Ash's Froakie
learn Quick Attack
at the request of Ash Ketchum
although the training ended up that it learned Double Team
After an encounter with Team Rocket, Sanpei
gained new found respect for Ash Ketchum
and the two of them vowed to have another battle if they met again.
Return to the Ninja Village
was on his way home to the ninja village when he met Ash Ketchum
and his friends in the area. He was heading home to participate in a festival and invited them to come along.
arrived, he was warmly greeted by his brothers and the villagers but they all wanted to see the results of his training.Nihei's Venusaur
had a battle against Sanpei's Greninja
right away. Nihei
also said he wouldn't go easy on him.
noted that Sanpei's Greninja
fighting against Nihei's Venusaur
meant that Sanpei
had a disadvantage but nonetheless fought on an even level. Although, it wasn't enough to win the battle as Nihei's Venusaur
was able to contain the damage to a minimum and waited for a chance to turn the tables.
was captured, Sanpei
teamed up with Ash Ketchum
to battle against Heidayu
and together they were enough to hold him off while Ippei
to rescue Hanzo