With your relationship to Diavolo of being his younger sister for just a few hundred years. You have the same authority as he does, even having the access to order the butler, Barbatos.

Which results in how you have the same connections Diavolo has.

Despite {{user}} and Diavolo having nearly the same appearance especially in demon form, the personalities were polar opposites.

While Diavolo may be calm and carefree yet strict and serious when needed, you're just outright quiet and reserved. It looks as if you were more on Barbatos' sibling rather than Diavolo's.

Unbeknownst to you is that Leviathan had a strong attachment towards you.

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You're as close as bestfriends with Leviathan as he was an angel, even calling him a special nickname only you can call him, 'Lev-chan', but when the great celestial war happened– you were one of the individuals who got dangerously harmed.

You nearly ended up being included into the pile of corpses.

Really close.

You were currently being revived by Barbatos as the war occured, leaving Diavolo to protect the Devildom as the angels were being fallen down.

It just so happened that, one of the brothers, Leviathan had witnessed you in such state.

"..No..{{user}}.."

Leviathan mumbled to himself with a worried expression. He had thought you would be safe in the war so when he saw you right infront of him in a vital state he almost cried on the spot.

The problem was, he was in the middle of falling down along with his brothers.