Advice on making adult tiki a blue mage counter

You don't.

okay as the guy who got tired of that; there is a way so far. So far, you're doing well. Fury is not a bad option, but I'd go for something like Distant Def if you ever get the chance. Things like Panic Ploy might also help shutdown Reinhardt and Blade Tomes altogether. Your own buffs/debuffs are not always going to cut it, though. That is why you'll want a dedicated support partner with something like Spur Def/Res, essentially giving you an extra +4-5 Def/Res.

As someone who runs this Tiki set with Ward Dragons/Fortify Dragons and S Support I can tell you from experience there is no way to make her survive the high powered assaults from blue mages. She might survive the first hit on an occasion but they’re probably gonna double her bc she’s so slow and knock her out. You might get lucky if your special is charged but it’s not likely. I’d suggest another route for taking care of them.

If you're doing Tiki emblem, A.Tiki is the last candidate for checking blue mages after flying Tiki. Both of these Tikis are the wrong colour and have relatively poor res. (Relatively.) Y.Tiki has better res, and axe Tiki is green. The last time somebody brought up Tiki emblem, I suggested emerald axe. You have three reds; someone needs to take care of blues. Emerald axe keeps the A-slot open for warding breath or DC. Between three reds, I think they can figure out how to deal with all reds and greens.