The Guthrie's (other than Sam) have gotten a weird lot. In her first appearance, Paige turned into a little songbird, no skin ripping weirdness, just straight up animal shapeshifting. The second time we saw her, it was all face-tearing Clive Barker's X-Men stuff. The first time we saw Josh/Jay, he used his mutant voice to power up Dazzler so she could save them (remember when she needed sound to transform into light and Reed Richards had to make her a sound-storage device so she could use her powers outside of a rock concert? Good times. Now she just throws lasers...). The second time, he had red wings. I don't even know what goes on with those kids. I half expected Melody to show up with gills and tentacles...
Anywho, Jay Guthrie. Dude who cut his own wings off because he hated being a mutant so much, and ended up betraying the team to some nutjobs and getting Wallflower killed. Really puts the 'ick' in Icarus.
And now he's alive again. That's gotta be interesting. Does he remember everything he did? *Does everyone else?* (Does Wallflower know? Does Elixir, in whose arms she died, know that Jay is why it happened, and did he know it when he resurrected him *against his will?*) There's a story waiting to be told. Lot's of pent-up drama.
But, on topic, I'd rather he had some sort of mesmerizing voice, or even disorienting subsonics, than a sonic blast like Banshee and Siryn, to be different. Maybe some funky vocal tricks, like the ability to impersonate voices or perfectly replicate animal or background noises with his mutant vocal chords, even to abnormal volumes (like create the sound of an entire crowd, cheering, or an explosion, just not 'sonic screams').
Anything but the healing blood 'related to Angel' nonsense, because that just means that Angel is also related to Jay's sister Paige, which makes their relationship *even creepier than it already was.*