Are the wings, then, a legacy of his father or Meridia? He appears to have them, though they lack feathers, obviously.
They may be an anatomical feature of his and another reference to Nephilim and fallen angels of mythology, or perhaps it's an Ayleid thing. A lot of Ayleid statues are depicted with wings. Birds and wings seem to be a cultural feature of the ancient Ayleid Empire before it fell to ruin. They're the exact same color as his armor. It's unknown if his cuirass has holes in the back and they're his actual wings or if they're just an ornamental piece of armor.
edit: Upon closer inspection from all angles it just looks like his armor was crafted with ornamental spikes which resemble naked wings. It's probably meant to be a slightly OOC symbolism regarding Nephalim, the gigantic sons and daughters of disgraced angels. No Dev or official source of lore has ever mentioned Nephalim in regards to Umaril or the Ayleids but considering the similarities in the story I'd consider it a likely inspiration.