I can see Delirium as Fallen's mistress

Delirium looks like she could be a beautiful goddess or queen and Echo could be her slave girl. That's kind of a 'couple' right? XD

Mh... nah, not a couple. Maybe a couple of fighting siblings, but nothing romantic. xD;

nahhh.... I don't think so

Doubtful.

yes because they look cute

i don't think so XD'

Maybe, I could see it working some how.

They could work in away.

Nah, a hero and a succubus? I don't think so XD

Ehhh, nah I don't think they would lol

Maybe, I'd say they could.

I'd go with yes. Their styles are pretty similar, but they're still different enough.

No. >.<