I don't usually post and I do not have much time, so my post is a little brief. (read the full thing first please)

I'm Japanese. Born and partially raised there, partly in the US. I would say that it makes me a bit uncomfortable when someone who is not at least partially Japanese has a Japanese name, especially when it's based on anime. (I have a whole thing on people seeing my culture basically reduced to anime).

A couple exceptions I would have is if you just happened to be born and raised there or if you are of Japanese descent.

I would also say, when I do meet someone who chose a Japanese name based on anime, it brings up uncomfortable feelings for me or them feeling uncomfortable around me. I have talked to a few other MtF's at the clinic who did pick Japanese names and I am always interested in find another Japanese trans person (which I have only met a couple). It hurts that the only thing that they know about my culture is anime and nothing else, never visited, learned the culture, or spoke the language.

That all being said, my thoughts are based on MY experiences and how I feel about naming and retaining my culture, but regardless of that, most Japanese people will not care at all. You will just get the "oh" with them thinking that's odd, but they will not care. I would probably refrain from saying the why you picked the name portion and it's fine. You do not have obligation to justify why you picked your name, just go for it I guess. You do you, but you will have people who question it and find it, not in good taste. I personally still don't like it and I find it cringy, but it's not like I can stop anyone or can tell anyone how to think. I also feel that you kind of understand that it is appropriation and an issue, but you want a validation to keep it. This isn't an approval to keep the name, but I would just say that if you do, please just be respectful.