For instance there is the popular anime titled “Sailor Moon” which is written in Katakana like セーラームーン and stranger still the second season is called “Sailor Moon R” (I think for “return”) and is written セーラームーン R.
My understanding is that Bopomofo never caught on particularly well
https://en.wikipedia.org/wiki/Bopomofo
it is still used in education in Taiwan but in Taiwan, the mainland and the rest of the sinosphere people who want to spell out Chinese words are more likely to use Pinyin