LogFAQs > #984448458

As long as you saw Clive in Muse, you're good.

Gilbert's mostly rng, since you don't have much control in that battle. It'll work out more often than not, I think. He can also permanently die, but as long as it doesn't specifically say died, you should be good.

I think all of the easily permanently missable characters have been mentioned, although there is a point of no return you need to have the 108 by, eventually. The 2nd time you have to go to Rockaxe.