No. The only place where there are humans is on Earth, or in low Earth orbit.
Yes it is possible for humans to live on Eris.
None. There are not even any plans in development to visit Eris. Humans have never gone farther than the moon. Pluto is the most distant object visited by a man-made object.
Eris has one satellite
Eris doesn't have any rings.
I don't think any one nows because it's so far away. NASA doesn't even have real photos of (Eris/nibiru/xena). They do predict how it looks. But that's it.
Yes. Eris orbits the sun.
There haven't been any probes sent to Eris.
the voyager has traveled by iy
no but Eris isn't a planet it is a dwarf planet.
no man could not live on Eris is too cold for any form of life.
It is highly unlikely. Eris is too cold to support any conceivable form of life.
Probably. Eris is too far away for us to make out and of the features on its surface and we have not sent any probes there.