Spotted Jasper {Blind Cinnamon Roll}

She's a "defective" Sweetheart. She served under Pink Diamond (along with cannon Jasper)

She has a visor that covers her eyes and nose.

She's a Lover not a Fighter, and has a little heart on her right cheek.

She can "see" like Toph in Avatar the Last Airbender.

Gem is where her right ear should be.

I think she'd be voiced by Annapantsu