The only other Vorlon that was ever seem would be the conceptual drawing of Kosh's mate Velana. I don't think she or the mate concept ever became canon / listed on screen.
I guess Lyta was too jealous, and went to the Vorlon homeworld to fight for her first one.![]()
JMS on Velana, Kosh's "hetro-life mate" :
Excerpt from The Babylon 5 Scriptbooks, Vol. 1 pg. 17-18
Probably the most significant difference between this draft and the final production version is that presence of Kosh's life-mate, Velana. The deeper we got into pre-production, the more I felt that the character simply didn't work. In combination with some of the dialogue that I had orginally put in primarily so that the execs would Get It [sic], her presence made Kosh too human, too conventional, too familiar conceptually. Kosh had to be mysterious, and having a mate seemed to work against that. In addition, the main reason for having her there was to do the memory-scan of Kosh after the assassination attempt. But we already had a telepath on board in Lyta, so it made sense to shift this action over to her. Once that was done, Velana became redundant.