Not much to say, other than I really like this style :) it feels cozy, and makes a sketch like this feel less lazy and more alive, for lack of a better word.
Reisen 2 is such a weird character too; she has a pretty decent role but in only one story, and even then not much is revealed about her, and she kinda just does what other characters tell her to. There's something very appealing about her design though, as simple as it is. Definitely one I wouldn't mind seeing more of in future stories!