Looks:

A shorter tail and skinny legs. Sunny has a
similar color palette to her original design, though I imagine her with small specks of black on her wings, to show her NightWingness.

Sexuality:

I believe Sunny is an asexual bean that doesn't need no man (or partner in general) to carry her through life.

Voice:

Luz Noceda / The Owl House

Other Headcanons:

While working at JMA, Sunny visited her father every night and talked about their days. Stonemover enjoys these visits.