I think you can think of Yunara as a ranged Jax.

Just tried a quick game with Yun Tal and Runaan's, crit around 50% and then swapped to AP, it's strong.

She has AP ratios, but Riot put shackles on her passive, so going full mage is definitely just for fun.

You need to mix crit and AP items evenly to get the best efficiency.

It's easier if you think of her as a bit like Jax. Like she has a good balance of AP and AD??

Let me explain the items too.

First of all, Zhonya's value is absolutely Goat. I tried it around 3-4 items and it's really strong. You can supplement the lacking AP while also increasing survivability.

Runaan's on Yunara is already famous, so everyone knows.

Guinsoo's.... is also good, but this is definitely as iffy as Kraken on Master Yi.

For early 1-2 items, you need to build crit items, and late game, there are plenty of other good items to buy instead of this.

IE.... I also think it's definitely iffy.

It's an item that needs to be completed by at least 3 items to be efficient, but it feels a bit burdensome for Yunara.

From Yunara's perspective, who needs to mix AP, if you go full crit by 3 items, your skill damage suffers a lot. It's also hard if tanks build armor.

For laning phase, think of her as Vayne.

Going to another lane without support care is fine for top, and you need to manage distance well.

If you run into long-ranged champions in top lane, you can't even resist and just get pressured and starved.