1. Conclusion on Chacon's Performance and Connection to Cartisia
Chacon is currently the lowest-rated character in Undawn.
She's expected to be a part of Cartisia's kit, but Cartisia might be strong enough without Chacon, so be careful.
Her usefulness might be low until Cartisia is released.
2. Problems with Synergy with Gyeon and Echo Usage
It's more efficient to use Mortefi in combination with Gyeon.
Chacon has a skill structure that doesn't allow her to properly utilize the Bai Lu Echo, so you have to use a different turtle Echo.
Because Bai Lu Echo efficiency is low, other Echo setups aren't very efficient either.
3. Problems with Chacon's Setup and Breakthrough
There's not much point in sweating Chacon's setup.
There's nothing special to worry about other than taking care of Resonance efficiency.
Even if you set up for damage, the damage doesn't come out well.
It's also hard to recommend Breakthrough at the moment.
4. Opinions on Echo Setup and Signature Weapon
It's better to focus on Resonance efficiency rather than damage for Echo setup.
I recommend Resonance efficiency for 3-cost, and HP or a different turtle for 4-cost.
I recommend using skills at 666 for cost-effectiveness.
Her signature weapon isn't essential, but it's worth considering if you want to make Cartisia stronger.
A standard 5-star weapon is enough to cover it.
5. Usable Chacon Compositions
You can use her instead of Mortefi in a Gyeon party, but the efficiency is lower.
You can combine her with Pebi or Jenny to utilize optical effects, but the efficiency is lower compared to other combinations.
There are no clearly usable parties at the moment.
6. Final Conclusion
You can consider her as a Cartisia launcher, but you need to watch Cartisia's performance.
There's no reason to pull her at the moment.
Even if you try to use her forcefully, the conclusion is that it's not worth it.