堕天使(da-tenshi) is not pure devil and not suggested only as "Satan".
堕天使 means just An Angel(天使:tenshi) falt(堕ちた：ochita) to hell(or dark side) and became a Devil.
"Lucifer" can not be converted into Japanese kanji(漢字).
In Katakana(カタカナ) it is "ルシファー". (same sounds of reading)
Japanese Kanji :
(pure) devil : 悪魔(aku-ma)
devils family : 魔族(ma-zoku)
King of devil : 魔王(ma-o : "o" is long tone)
King of hell in buddism : 閻魔(en-ma)https://en.wikipedia.org/wiki/Yama
Chinse kanji : (if possible)
lucifer : 路西法
(pure) devil : 魔鬼
King of hell in buddism : 閻摩, 琰魔, 閻魔, 夜摩, 剡魔, 焰摩
In Chinese(as lang), the reading of English is converted to kanji directly as same or simlar sounds.https://zh.wikipedia.org/wiki/%E6%83%A1%E9%AD%94%E5%88%97%E8%A1%A8
And, first anwer
黒(kuro) means "night","dark,blind,shadow(side/world)" and "bad" as slang,
豚(buta) means "fat(デブ)","ugly/fugly(ブス)","big eater(食いしん坊)" and "incompetent/no talent(無能)" as slang.
So, meanings is not so far but not so close.
(S)he may dislike "Dia Kurosawa" or similar girl/woman charactors in Manga, Anime.
豚 is one of abuse/insult used for cute female idols(for real or not)
also for female idol fans(guys) as "idol Otaku" a lot in youngers.https://pbs.twimg.com/media/C1o9zhLVIAAj5_R.jpghttps://auctions.c.yimg.jp/images.auctions.yahoo.co.jp/image/dr117/auc...
In the past, we used to use 黒豚 as an abuse/insult for incompetent "black" people(黒人: koku-jin).