@1000sunny I didn't put the title there. But the official translation in the english light novel is Lyu, so I go with that. There is no right way to translate it. Everything wether it is Lyu, Lyuu, Ryu or Ryuu would be fine...
@sysco That's what's in the title. I went with what the official Light Novel used for names though, which is Lyu. Same for Runoa, which could be also translated to Lunoa or more freely Lunoire. I don't want to switch between different names when reading Light Novel or the Manga.