So, I suggest we come to a unified decision from the many options.)
Here's what else I've found regarding the clues:
1) "Abandon all hope, ye who enter here" is also an inscription on the gates of one of the fascist concentration camps (Mauthausen, Austria).
2) "Abandon all hope..." (English) is the tenth episode of the fifth season of the American television series "Supernatural."
I haven't read it thoroughly, but it has something to do with Lucifer.
3) It turns out that Dante is not only an Italian poet but also the main character of Devil May Cry.
4) Neyra's avatar also depicts Rezo.
5) Amko's avatar: gunslinger girl - Rico. It doesn't fit in any way.

В тихой однообразной жизни всегда так бывает: каждый отдельный день бесконечно долог, но месяцы и годы мчатся с непостижимой быстротой.
I wanted to offer you some flowers, but a crown would suit a princess like you much better
Смысл жизни в том, что жизнь на тебе не заканчивается