"Epic" is a music genre? I'm so interested in this, please tell me more! I need examples.
Lyrianna definitely looks like the kind of name one chose for oneself. It's got strong "magical girl main character in a YA novel" energy. If you're shy about that and want it to look "natural" I'd say maybe simplify it (to
Lyra or Lianna maybe) or stick with
Delphina. Also Lyrianna would probably be shortened by people, it's very long. If you're ok with that, then it's all good, but if not, keep in mind you won't hear your full name very often. You will *always* be asked to spell Lyrianna and people will absolutely butcher it, so keep that in mind.
I love
Delphina and think it matches what you're going for really well, but I love brainstorming so I'll do some of that anyway.
Sensual and cute at the same time, so, something with coquette vibes..
DollyLalitaDarlaLettie (like
Sophie's sister from Howls Moving Castle)
Simone,
Simona,
SimonettaBettinaMischka (this is technically a masculine nickname but it's so cute. Look more into Slavic diminutives, they are always a great mix of sexy and sweet)
SuzetteMimiClementineSukieRosalita
Pomona ("Pomme" would be so cute)
Mirai (this is a kind of trashy modern Japanese name that means "the future" and I've always thought was so cool, I just love its silvery aura)