Possibly your samurai, in 2.9
That said, I previously mentioned that the Miharu clan would have invited anyone that served on the original Miharu to the christening. Rolf wouldn't have been an exception. If Rolf was present from the first, he likely wasn't at the same hotel (it was my excuse to justify the absence of people that should've been there). Rolf might have possibly not been caught in the crossfire when the Shadow Vipers crashed the christening ceremony (which was stuffy), and given the appearance of hostile power armors, he might have gone to Hoshi to secure a power armor for himself, meeting Nimura on the way.
When Hinoto escorted the Empress to the Asamoya/Hoshi, Rolf remained with the Empress to protect her while she escaped to safety, while Nimura left to try to find those Hinoto left behind and render assistance.
So, Rolf can't be immediately present in 2.8 and 2.9, because he's already busy elsewhere. Also, frankly, I don't really have the room for someone not 'senior staff' where my narrative is headed. But in the latter half of 2.9, I'll be able to bring in Sora, Koyama, and your samurai bodyguard.