Fae

Fae is usually best as a tank and her Resistance is greatly appreciated as a boon. Her speed is decent, but she won't double hardly anything within the current meta unless she has QR, which is honestly a necessity. Magic soaking and ploy skills are great for a resistance build.

Her HP is the best bane anyway, and is still plenty viable for Panic Ploy

I personally use +Spd -HP Fae. I can’t argue whether or not that’s the best IV for her, but I’ve had a great experience with it - it helps her avoid quite a few doubles, especially with a little speed buffing help from Drive Speed and/or a support with Nowi. Topped off with an earth blessing and F!Grima’s Speed boost, she can actually get quite fast.

That said, I imagine +Res paired with Iceberg and Steady/Warding Breath could be pretty good, too, and would make her a great magic tank.

Just my two cents. I don’t have a definitive answer, but I hope this info helps you in some way.

I'd go for the Res for now, but I personally use a +def/-HP one myself with her breath refined for Def. It takes a lot to bring her down.