What trait should I keep?

The best trait is the one that supports your unit's job, such as damage for carries, cooldown for support, or survival for push teams.

Anime Squadron Traits | Anime Squadron Guide

Overdrive

Use Overdrive on your main carry when boss waves or final enemies need a shorter burst window to clear safely.

Best on upgraded damage carries.

Tempo

Use Tempo on support or control units that need more frequent abilities to keep enemies slowed, stunned, or weakened.

Best on units with powerful active effects.

Command

Use Command when your squad already has a strong carry and needs team-wide value instead of another selfish damage boost.

Best on supports that stay useful all fight.

Power

Use Power during early and midgame progression because it gives straightforward damage without complicated conditions.

Good temporary trait for damage units.

Resolve

Use Resolve when a key unit dies before the fight is decided, especially while pushing stages above your comfort level.

Best for progression attempts and longer stages.

Efficiency

Use Efficiency when you are repeating safe stages and want smoother clears without relying on risky burst timing.

Best for repeatable currency or material routes.

Sharp

Use Sharp as a temporary damage trait when better scaling options are unavailable, but replace it for stable progression.

Use early, then reroll when resources allow.

Training

Use Training only during the earliest stages, because its general value is easy to replace with stronger specialized traits.

Keep only until you can reroll safely.