I usually don't do this, but for anyone contemplating the Babylon 5 crossover, I will share the plot bunny that came to mind while typing up my sign-up...
Immortals don't only occur among humans, though they do seem to occur more often. On Babylon 5, G'Kar and Ivanova (being the latest alias of Katherine, the Immortal in Two of Hearts) maintain a not-always-easy alliance. A later encounter might involve the two of them helping each other, or not. Figuring out how this works in the context of Babylon 5 canon - or selectively ignoring some of the canon - is left to the author.
And my personal canon for NCIS Los Angeles:
Hetty is Immortal, and one of the older Immortals at that. She's one of Methos' early students, prior to the Horsemen, and she genuinely thinks of Kronos as nothing more than very irritating (she compares him, in fact, to a hunting dog trailing after his master, in reference to his constantly looking for Methos).
Callen may be pre-Immortal, or not, that I leave to the author.
Criminal Minds: Penelope Garcia is Eulalia Merce Vilaro, from Catalan, born in the early-to-mid 1400s, first teacher is Ramirez. She doesn't like the Game, and she puts her mortal life first, and being Immortal a often distant second. Her Watcher is Derek Morgan, and she's at least passing familiar with Matthew McCormick, and possibly friends with him.
Immortals don't only occur among humans, though they do seem to occur more often. On Babylon 5, G'Kar and Ivanova (being the latest alias of Katherine, the Immortal in Two of Hearts) maintain a not-always-easy alliance. A later encounter might involve the two of them helping each other, or not. Figuring out how this works in the context of Babylon 5 canon - or selectively ignoring some of the canon - is left to the author.
And my personal canon for NCIS Los Angeles:
Hetty is Immortal, and one of the older Immortals at that. She's one of Methos' early students, prior to the Horsemen, and she genuinely thinks of Kronos as nothing more than very irritating (she compares him, in fact, to a hunting dog trailing after his master, in reference to his constantly looking for Methos).
Callen may be pre-Immortal, or not, that I leave to the author.
Criminal Minds: Penelope Garcia is Eulalia Merce Vilaro, from Catalan, born in the early-to-mid 1400s, first teacher is Ramirez. She doesn't like the Game, and she puts her mortal life first, and being Immortal a often distant second. Her Watcher is Derek Morgan, and she's at least passing familiar with Matthew McCormick, and possibly friends with him.