Ninja Tathagata is probably that aspect of Tathagata Buddha who is a ninja. He might also be the scion of a clan of ninjas who adopt the names of classic Buddhas when they achieve Ninja Nirvana. It’s hard to say without infinite wisdom.
Episodes with Ninja Tathagata:
|The River at the Edge of the World||Legend|
|Dumping Glue on a Log||Legend|