(OOC: D'oh! It's always tough to lose or partially lose a player in a lot of my games--I remember when BS left a little while ago. I'd of course like you to stay when you can, but in the end, we should pick a combination of games that you enjoy the most and in which your character fills a necessary role.
In VP, I'd agree that M'ress is pretty crucial. She's an important tank, often shares leadership roles with Trayah, and she's the only remaining PC connected to Pleione and Slagg, which with her absense would create a triad of NPCs not too connected to the others, which is bad.
In DT, Zykovian not only has a lot of things to explore and NPCs connected to him, he also helps balance Melody among the officers of the Voidseeker, especially considering FX's reactions which seem to indicate Mhrazhar will brook no delay in splitting from the group and going to Arris. I was hoping his own archenemy being in Eldiz would convince Mhrazhar otherwise--ah well. Definitely agreed that Zykovian is important.
In KoD, Verra, her visions, and her connections to Alucinor all will become important later on, although we're early enough that if you absolutely had to leave, I could of course write that out and/or try to NPC,
In SoD, you don't know it yet, but Yuriko has something major to do in the main part of the quest. Incredibly major. So does Diedrik, actually.
Thanks to numerous Diplomatic Immunity delays, Ferris hasn't gotten very far, so that one would be less painful to lose.
Thurgan provides a level head to match Cade's in a LEW group that sometimes goes crazy, but he's quiet enough that it might be doable to write him off to NPC status.
The last three you aren't in my game.
I'm of course sad to see you leave any of my games, but RL absolutely must come first, so I hope those suggestions help!