3D Dot Game Heroes has a custom character transfer system. Edit data for the perfect Gundam, Snake or Cloud block model can be copied to a flash drive and shared on the Internet.
From Software is distributing customized characters too. You can get models for a yellow ancient hero, soccer player, dwarf, and maid at the official site.
Hopefully, the still unannounced North American publisher will make the international version of 3D Dot Game Heroes compatible with Japanese edit data.