What if Nico Di Angelo had a Twin Sister?

Nico has a Twin Sister

How they will sneak up on you

You will be standing in a shady corner at Camp Half-Blood, searching for your missing object that you lost and you suddenly feel a chill behind your back. You turn around, and you find your nose stuck in a mess of shaggy hair. Nico slowly looks up, and you guys are nose to nose.

"My twin brother is gggaaa---" you turn to your right and you see a tiny girl cupping her hands around her mouth. You sigh.

"What. Its the fact," they both harmonise. Man, they are always making you feel dumb with their shadow-travelling.
How They will be Treated
None of the campers will get near them. Just looking at them, one leg on the wall and holding on a can of root bear for Nico and a juice box for the twin sister. Only sone of the brave ones will approach occasionally, offering some food, but they will run away when Nico's twin sister (comment what the name should be) glare at them in the eyes and squeeze her juice box. The red grape juice box looks like your future if you got close to her.
Relationship
Well, as everyone already knows, Nico has Will. But what about his twin sister? Well, her glare a day, keeps all the boys away.

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Alright guys! That's all my brains can think of, and I enjoyed writing it! Thank you so much for reading my unimaginitive fan fiction... And yes, I am a fandom girl... See you all next time!!!