Chime

Chime is a Crown-exclusive buffer Burst II, so in Crown teams she can contribute firepower support when the conditions are met.
However, she is not established as a general-purpose core pick, so whether she gets used depends on the content and your account's roster.

The key point is that the buff target of Skill 1, Skill 2, and her Burst is effectively locked to her King (Crown).
At battle start, Chief Aide1 continuously grants Wish (Increased ATK based on caster's ATK), and on entering Full Burst, The King's Secretary2 adds Daily Report (increased normal attack damage multiplier), boosting Crown's damage contribution.
Her Burst For the KingB gives all allies Re-enters Burst Stage 2 and increased Max Ammo, while also giving Crown Loyalty (increased attack damage), strengthening firepower support for a short time.
So Chime is less a strong standalone DPS and more a dedicated support who assists and amplifies the firepower of Crown-centered teams.

Auto works by default.
However, it's important to include another Burst II besides Chime so the Burst cycle doesn't break.
If you go manual, just time her Burst so For the KingB overlaps Crown's damage window.

Chime focuses on delivering buffs rather than her own damage, so Max Ammo and Reload stability (Resilience Cube) and base ATK support (Assault Cube) are safe choices. In stretches with survival pressure, use the Vigor Cube as the second option.

Keeping Crown's buffs up matters more than Chime's own damage, so ATK lines are more noticeable; fill the remaining lines with stable options like Hit Rate. Rather than overinvesting costly Overload gear on Chime, prioritizing Crown or the main DPS is typical.

In practice, the biggest gains come from The King's Secretary2 (Skill 2) and her Burst. Chief Aide1 (Skill 1) is a permanent buff and worth investing in later, but Skill 2 usually takes priority.

She matters most in Crown-centered boss fights and Raids; for general Story pushing she is a lower priority than general-purpose Supporters.

She stacks ATK, normal attack damage multiplier, and attack damage on Crown one after another, raising the combo's firepower.
Her Re-enters Burst Stage 2 effect widens cycle flexibility, making Crown-centered squads easier to run.
She is easy to obtain and limit break through events, so she has uses during account growth.

She is essentially built for Crown only, so her value drops sharply in squads built around other DPS.
Her team-wide utility (general healing, defense, AoE support) is weak, making it hard for her to replace a general-purpose pick at the B2 Burst stage.
To feel Chime's performance, Crown's investment (skills and gear) also has to be up to par.