Foreign words, I think.
If you can give us some examples, it would be easier to answer your question.
Good question AwesomeNagisa-歌手さん, I have always wondered this myself.
Masakosan, for an example of this, below are some Kyary Pamyu Pamyu lyrics in romanji which feature some words in all capital letters. These words are shown in capital letters in all occurances in the song:
kitto aresou ne OTONA tachi no HIMITSU
mahou no mizu o chougou shitari suru n'da wa
PI-CHI BERI-MERON no amasa dake janai no?
TSUN toron isogashii neko mitai ni naru?
To be honest, I don't know why the words are capitalized. I checked the whole song, but I couldn't find any reason for that; They are not names. And, Ninjin Miojo-san, they're not foreign words either;
Maybe, the words are kind of keywords for the song? Emphasizing?
Does anybody have any idea?
Thank you so much for your time and effort. I thought it may be for emphasis though often reasons to emphasize a certain word was not apparent or obvious to me, so I was not entirely certain.ローレン
Commented 7 years ago
It probably similar to how other languages need to raise their voice a little higher on words, its possitble that the bolded words mean that they are meant to be be explicit, hence the "bolded"