How to build a SY!Tiki?

If you really want to give her Distant Counter, Vantage would work well and since she will (most likely) kill on the counterattack, the 22 Res shouldn't matter as much.

I think it's worth going for because her breath has the adaptive damage anyways

You would do well to realize that it's very hard to pick a bane for her. I prefer def because the res superbane with her thin HP puts her into the edges around Nowi's OHKO range. Hit and miss; toss a coin. You're going to have a hard time finding a OHKO against Nowi due to colour disadvantage, so you will very likely need to double her and take a hit in the process.

I don't like DC on 22 res, especially when she only has 40 HP. Some people would go for it anyways; I'm not one of them. I cannot find a better recommendation than fury. Nowi now needs 55 atk to OHKO her, which is uncommon unless she's receiving a hone. It's really a matchup of inches. Enemy Tikis, first to strike wins more or less without exception.

For B-slot I tend to go for desperation. She has the speed to focus on player phase; she doesn't really have the HP to survive multiple hits except maybe to her def? I guess renewal might not be so bad then.

C-slot: Goad/hone fliers. She wants to receive the ward/fortify that's on the team.

Here, take my shitty +Atk -Spd one instead. I’d much rather deal with a res superbane than a shitty speed superbane that’s unusable.

Distant counter is good because of adaptive damage. Quick Riposte should be taken to ensure doubles against fast mages if you can’t one shot them.