Sora

A Burst 1 supporter who is hard to use as a core pick in practice.
Closely Carried Secret1 gives burst healing and debuff cleanse, but its long cooldown leaves big gaps in general story and farming.
Secret Carry-OnB only meets its trigger condition when enemies have parts, and her emergency healing value shows relatively well in Arena.

At battle start, Boarding Procedure2 grants herself increased healing given.

When allies destroy enemy parts, Secret Carry-OnB grants all allies storage and Increased ATK based on caster's ATK. Storage holds excess HP recovery and stacks up to 5 times.

Closely Carried Secret1 grants all allies healing based on the caster's final max HP and cleanses 1 debuff.

In main PvE, auto play is enough.
To control debuff cleanse timing in Arena, use Sora's Burst Skill manually in sync with the Full Burst window.

Needs manual input.

Healing given fits Healing Cube, and Closely Carried Secret1's HP-scaling healing can be boosted with Vigor Cube. If standard Rocket Launcher Burst Gauge generation is a burden, consider Quantum Cube. If you have a higher-level Harmony Cube, look at level before the order.

Her damage contribution is small, so priority is low. Setups mixing in Max Ammo lines to align reload and firing rhythm do appear.

Closely Carried Secret1's healing ties into Boarding Procedure2, so raise S1 first. Secret Carry-OnB has a part destruction condition, so its priority is low.

She is rarely a core pick in story and Tower. In boss fights where enemies have parts, Secret Carry-OnB triggers intermittently. In Arena, her value shows when using emergency healing and debuff cleanse at once.

Closely Carried Secret1 can give all allies big burst healing and debuff cleanse.
In fights where parts break, storage and Increased ATK apply together.

Her long Burst cooldown makes it hard to sustain healing tempo on her own in the same round.
Secret Carry-OnB practically never triggers without enemy parts.
Storage only feels impactful once stacks build up.