Does the Other also exist in Echo? Is The Other what makes Echo Echo?
There are no humans in Echoverse. So that's a no. Unless they're dumb and not only timelines are canon (timelines are canon in Echo, all routes are canon so lol) but they also make dimensions now. Different universe. One is Adastra universe, one is Echo, etc. And then they connect it with the Other. That would be the only way to do it but I don't want it. That sounds dumb. Echo demons can just be that. Demons and ghosts and stuff. It doesn't have to be space evil overlords.