小手乌比 (English translation: Little Hand Oobi) is the Standard Mandarin dub of Oobi.
The dub aired on HaHa Nick, a block of Nickelodeon shows on the channel SMG. It premiered on May 2, 2005, one day after the block launched. (source) Episodes usually aired once every weekday at 9:00 AM. (source)
To promote the dub, Chinese versions of four Oobi flash games—Music, Draw, Animals, and Bubbles—were made for SMG's website. The audio was recorded and edited at Tooncool Digital, a studio in Shanghai. (source) The games featured the same sprites and controls as their English counterparts, but Oobi's Mandarin voice actor dubbed over all of the dialogue. These versions can still be played on an archive of the SMG site (here).
Uma's lines were dubbed by Hong Haitian, a prolific voice artist who has worked on many Chinese versions of foreign shows. As of 2015, she still considers Uma one of her favorite dub roles, and she calls her work on Oobi one of her "masterworks." (source)
Since there is currently no footage of the credits online, it is unknown who dubbed Oobi's lines. However, his Chinese voice can be heard very clearly in HaHa Nick's flash game dubs (example).
All of the long-form episodes were dubbed in Mandarin. As with most dubs, the shorts weren't aired or dubbed over. A few of the episodes' original air dates can be found on SMG's schedule archive.
Known premiere dates:
The Chinese theme has similar lyrics to the original opening song, but there are two notable changes. Kako and Grampu's parts are cut, and unique lyrics are added to the end about Oobi "traveling the world" and "having many dreams."