She's an undead robot. Sort of? Death is complicated around here.

"Why? Best day of my- well, you know." She laughs heartily. "All Guardians start out like that. It's kinda confusing at first, but you settle in pretty quick." If you're lucky anyway.

Ghost is quicker to answer the question. It's a type of maple, I think. There are a few of them around the Tower."

Further down the passage, in a corner, there's another frame sweeping up the leaves with an old-fashioned broom. Super-advanced robot using a broom. Odd details, indeed.