Kiana Kaslana is one of those characters who feels like an old friend to fans of the 'Honkai' series, so it's totally understandable why people would wonder if she pops up in 'Honkai: Star Rail'. From what I've seen and played, she doesn't make a direct appearance in the game—at least not in the way longtime fans might hope. The universe of 'Star Rail' is its own beast, with a fresh cast of characters like the Astral Express crew taking center stage. That said, the game does sprinkle in nods and references to the broader 'Honkai' lore, which might give you that nostalgic itch if you're a Kiana stan.
Still, I wouldn't rule out the possibility of her showing up in some form down the line. MiHoYo loves weaving their narratives together, and with 'Star Rail' being part of the same multiverse, there's always room for a surprise cameo or an alternate version of Kiana. Until then, I've been enjoying the new characters and their stories—it's fun to see how 'Star Rail' carves its own path while tipping its hat to the classics.