Where can I post my videos for a niche blog with o identifying myself?

> YouTube doesn't seem to let you create more than one personality.

It actually does, you can create channels there : https://www.youtube.com/channel_switcher

There is an opensource p2p project called peertube, https://joinpeertube.org/ I never used and the numbers are very low and the frontpage contains some porn but it may also do what you want.