Is -Atk/+HP Ayra worth building?

Send her back home as a lamb for Mia's summoning (with good IVs).

I would build her anyways, she is just beyond broken - the ultimate powercreep - even beyond CYL powercreep crisis. Merge her later when you get one. Since you won't get a Mia now.

I would just keep her until the legendary banner. Chances are you'll get another one if you summon mostly on red. She's still a strong unit with those IVs.

She'll proc Regnal Astra pretty much every fight anyway, so being -atk hurts her less than you would expect.

Absolutely use her, she's great even with bad banes (mine is -spd and she still does ok lmao)

Build her, you can always keep her to merge with a better IV Ayra. Mine is -atk +spd. So, give yours a SPD +3 seal, cause her special procs every fight she's in due to her weapon effect + doubling almost the entire roster, and it adds 20 damage for me.

I think the worst IV for Ayra would be -Spd + Res XP But worst case IVs are still buildable. I've got a H. Jakob that has the inverse of his best IVs -atk + spd. I gave him the atk + 3 A slot skill for now. Waiting for Death Blow 3 or Swift Sparrow fodder. But I could also give him Atk + 3 seal and boom he's a + Atk IV value. So, just keep in mind that there's always a work around for bad IVs.

I actually have this exact same IV on mine. The other replies on here are correct, she is simply so good that even with a -Atk bane it really doesn't affect her much. Don't hesitate use her, she is just that good. If you ever do pull another than feel free to merge her (or keep her for that valuable Swift Sparrow SI).

I say no