What do you think about my Adult Tiki?

That's the same build I used for a while, but now that I'm staying for tier 20 I use this build.
Breath of fog (eff)
A rally for arena score
Aether (for arena score, Ignis is better tho)
Steady breath (DC would be good too for arena points and instakill Green mages)
Guard 3
Atk smoke (it's budget but it's flexible)
Quick riposte Seal
With breath of fog you won't need the close defence seal, and guard 3 it's Amazing since usually units want to use specials.
I know it's a gamepress build but it's amazing for arena and maps.

She is fine, her def is enough, if you want her to use another set, her breath of fog suprisingly powerfull.

Are there any specific issues you're experiencing with this build?