Kosh.
You won't find 'Crusade' info here. These Spin-Offs are all purely hypothetical and most of the time light hearted and zany. Enjoy.
John and Kosh
John and Kosh: Second Shift
Touched by a Vorlon
BABYLON 5: Rubion
BABYLON 5: Rubion 2 - Avalon
The Harlan Ellison Show