How many movies have Shuichi Ito and Yoshihiko Umakoshi collaborated on?

They have worked on 6 movies together! Their first movie together was One Piece: Baron Omatsuri and the Secret Island (2005) while their highest rated movie together was Zatch Bell! Attack of Mechavulcan (2005). They have not worked together since One Piece Film: Z (2012). They are most known for their animation films together.

One Piece Film: Z (2012)

Crew
Key Animation
Crew
Key Animation

One Piece Film: Strong World (2009)

Crew
Key Animation
Crew
Key Animation

Yes! Precure 5 Go Go! Movie: Happy Birthday in the Land of Sweets (2008)

Crew
Key Animation
Crew
Key Animation

Yes! Precure 5: The Great Miracle Adventure in the Country of Mirrors (2007)

Crew
Key Animation
Crew
Key Animation

Zatch Bell! Attack of Mechavulcan (2005)

Crew
Key Animation
Crew
Key Animation

One Piece: Baron Omatsuri and the Secret Island (2005)

Crew
Key Animation
Crew
Key Animation