Young Tiki of the Fog

The most threatening thing about dragons using Lightning Breath wasn't just that they now hit you with adaptive damage it's that they could hit you regardless of range as well. While personally I think Breath of Fog is an excellent weapon it's lack of DC properties really hurts it's overall usefulness since Dragons thrive most when making use of their adaptive damage.

Y! Tiki is most definitely best suited to be an enemy phase unit. I use a +Atk -Def version and even with that bane her defenses are equal so it's not like she's completely better suited to being on type of tank or the other. If you have spare DC fodder then I would consider using that for your A slot and just watch her wreck things armed with her new Breath of Fog, if you don't than something basic like Fury would still be really effective on her especially combined with her new HP regen effect.

Same situation same iv. I think I will pair mine with m grima, fortunately I do have steady breath and qr3. I haven't any Dragon buffs, so I'll have to decide c slot. I say why not. She's a fantastic unit.

Since breath of fog doesn't have the cooldown penalty and has renewal 3 built into it, you don't need steady breath on her to make her really strong.

You could make her into a more offense oriented unit with the brazen atk/spd (from Linus) or brazen atk/def (from Ares) or even fury.
She could stay in the brazen treshold kind of safely throughout multiple encounters, whereas fury would not hinder her hp too much over multiple encounters, so both are equally viable imho.

Her B slot will define her more, because you can choose from player phase (like wrath which would further work well with both brazen and fury) or enemy phase skills (like qr) and I'm honestly inclined to both options.

Keep in mind that you don't need to give her the effect upgrade on her weapon if it doesn't fit your playstyle or your team. You can give her a raw spd upgrade which also gives her hp, which could be extremely valuable as well.

Edit: added theorycraft screenshot

Y.Tiki has one of the better player phases among dragons. Not as good as +spd F.Grima or F.Corrin, she has her own strengths.

I like the effect refine on this breath of fog. The extra 5 atk should provide plenty of extra punch as well as beef up her defenses significantly. Fury is probably the A-skill of choice because the weapon's renewal effect offsets the recoil damage.

If the weapon effect is active, with fury your stats are: 58/33/40/28. Get a teammate to give her a spd buff, and you should be doing pretty well. vs dragons, effective damage gives +29 atk, which puts her well into OHKO territory except against Nowi, who has a lot of HP and colour advantage inflicting -11 atk on Tiki. You might come up 5-10 dmg short. Slow Nowis will get doubled and killed, but the spd-oriented Nowis will block the double.
The B-skills to consider are swordbreaker (now you have Falchions beat on both phases except for double-strike Alm - 41HP+40 def should be just enough to tank a hit, but it will be close. 58atk is probably 5-10 too weak to one-shot a Falchion wielder), renewal, ....other options I can't think of at the moment. With 40 def you can even consider brash assault (or take that in the seal and use desperation) but the prf's renewal effect might make this really difficult to maintain.