Older Sanyo devices released in the U.S. have standby pets known as "MyBuddy", similar in concept to machi-chara on NTT Docomo devices. In the case of the MM-5600 and SCP-8400, it's a 3D model!
On those phones, the models are stored as .MBAC files, which belong to Mascot Capsule 3D - the same model format that chara-den on Docomo devices use. https://twitter.com/RockmanCosmo/status/1773078313935769815


















