User blog comment:B214/High School DxD EX/@comment-26535460-20151114003037/@comment-36.70.147.118-20151114071740

Both forms are correct. 赤龍帝太子の籠手 means Gauntlet of the Red Dragon Emperor's Crown Prince ("Taishi" is Chinese-derived word for Crown Prince). Meanwhile, Fafnir is called "Kogane Ryuu-Kun (as a means of Airi's endearment to Fafnir, but TL prefers to use Golden Dragon King because that gives more dignified meaning of Fafnir as a Dragon King, among other things).

as for Villains' nomenclature, it's YMMV, but this is his original post about it:

After rechecking, I found some more errors in the summaries, especially the villain's name (mostly because I didn't check it with IME at first since I thought the OCR was fine, but the katakana scanning is a bit screwed, so I'm fixing it on the go now). You can check the original post for the fixes in the notes.

Also, after some Googling, I come up with a bit of transliteration (like Jop said, it needs to be worked out). Now I understand more how transliterating foreign names in Japanese can make a beginner translator go prematurely grey. Feel free to add yours.

The Invade Fanatic member appeared in chapter 3 is written as レンズオ ロアド の "Renzuo Roado no". Roado is, of course, road, but my friend told me that it was also a possible writing for "Load". Renzuo/Renzu have some forms, the closest being "Lens". So "Lens of Road" or "Road Lens" is an option, as well as "Load of Lens".

The next is ベゥパ・レコルグ "Beuba Rekorugu". The closest one to Beuba would be "Bubba", "Bubble", or "Babel", but Rekorugu is a bit strange, the closest word I can find is Spanish "recargua" which means "recharged", "reloaded" or even "rebuilt".

After that is ルマ・イドゥラ "Ruma Idora" Several sites listed Idora without the kana ゥ, transliterated as "Hydra". but Ruma is another undefined form, with alternatives like "Luma" or "Loom" or "Room". I think I go with "Looming Hydra" since it is the combination that have more meaning