Urianger is also tied to the Warrior of Darkness arc. But there are key characters in the game that stay alive as they are crucial to the main plot.

There are key characters ie.Yshtola who we know will never die simply because she is the face of this game and is the representation of this game in other games crossovers.

Thancred is also slowly becoming more popular.

At this point I think they would create new characters build them up in SB, and kill them off at the end of SB or the start of the next expansion.

I still think Yugiri might die protecting Hein someday since Goesetsu didnt die.