Well, I certainly didn't intend to spark this conversation. If asked if I was for or against random japanese words, I'd say I was against. It is a bit jarring running into them, even if i do have a general idea of what the words mean. In the specific case of that fic, I didn't add that in there, my co-writer did. I thought it was fine since it was a random splur of insults. People who speak multiple languages do that sometimes.
There is one other exception though: the use of suffixes. I use them in my other writings. It's just that there are some suffixes with meanings that just don't carry over to the words Ms or Mr. Plus, after watching a show, my mind is used to processing 'Nanoha-san' and 'Fate-chan', so reading/writing them feels more natural.
But, right, image thread... Not sure if I have anything that's not just a repost... Hm, I have some old stuff my friend drew for me: