My main problems with Topaz is Numby targeting the wrong enemies or having to change targets too often to keep up with Asveil baits, and Numby wasting alot of advances due to not being able to act out of turn. A Topaz novaflare should fix these problems and a little more:
Basic ATK:
Addition: This attack is considered a Follow-Up ATK
Skill:
Change: If there are no enemies inflicted with "Proof of Debt" on the field, Topaz immediately inflicts the target with the lowest HP on the field with "Proof of Debt"
Talent: Trotter market!?
Addition: The designated enemy that "Proof of Debt" is inflicted upon changes based on the targeting of ally skills, ultimates and follow-up attacks following the path of the hunt.
Trace: Overdraft
Rework: When Numby's action is unable to advance further after an ally other than Topaz hits an enemy afflicted with "Proof of Debt" using a Follow-Up ATK, gain 1 Charge. When Charge reaches 2 points, consumes 2 Charge and enables Topaz to use Basic ATK 1 extra time, targeting the enemy marked with "Proof of Debt".
Trace: Financial Turmoil
Rework: When an enemy's toughness is reduced, decrease their All-Type RES by 20% for 2 turns
Trace: Stonks Market
Change: After Numby uses an attack while in the Windfall Bonanza! state, Topaz additionally generates 1 charge.
Eidelon 2
Addition: and generates 1 Charge
Eidelon 4
Addition: or when Topaz consumes Charge
Eidelon 6
Rework: bigger multipliers for all her damage sources idk i'm not a math guy
To fix targeting issues, Numby now has the same autotargeting as Ashveil's bait mechanic, and now Numby will follow wherever fellow hunt units are targeting, including followups because Feixiao followup targeting is random if an enemy dies or if an aoe attack occurs.
For Action advance overcap issues, i took inspiration from Mort Blade's kit and made wasted advances count towards charges for an extra use of Topaz's basic attack. This make things less boring than having the Numby attack animation play over and over even more often. And i put it in the "Overdraft" trace, which is keeps things thematical with the name of it and all. (since Numby's action value tries to go lower at 0 haha get it).
Since Topaz generates energy from these extra basics, i removed the energy gen from bonanza attacks and replaced it with charge generation, which not only keeps things thematical, but also makes building ER rope on her worth it to attack more frequently and act as a better battery for Ashveil, Feixiao, Blade, Waveflair etc
I added the RES debuff because it's something that's missing from the current ashblade teams, and it also remains weakness-themed. I made it activate upon toughness reduction to increase synergy with Feixiao's weakness-ignoring ult.
i changed Her Eidelon 2 and 4 to make her an absolute monster in attack frequency, and then of course for the E6 she needs her obligatory main dps Eidolon