In My Hero Academia we see that when Midoriya is mumbling they use ブツ to symbolize it. Is this the rule for anime/manga/japanese or does it only happen in My Hero Academia?
1 Answer
ブツブツ or ぶつぶつ (the same word, just in katakana vs hiragana) is a standard Japanese onomatopoeia for mumbling, muttering, or grumbling to oneself. This list of Japanese onomatopoeia includes ぶつぶつ in it, along with many other onomatopoeia that show up in manga.