Kareel Odan is a joined Trill and the current host of the Odan symbiont. Kareel became host to Odan in 2367 after the previous host was killed during negotiations on Peliar Zel.

After being joined with Kareel, Odan attempted to renew the relationship of its previous host with Doctor Beverly Crusher despite the Trill taboo against Reassociation. The radical change in appearance and gender was too much for Crusher and she decided that she could not continue the relationship. (TNG: "The Host")