Turbo can use her Supercharge to fire shots from her Standard Skill or her ult
Turbo is immobile while firing her Standard Skill and her ult.
Turbo's Standard Skill allows her to fire one shot per Supercharge charge - for a maximum of 3 shots.
These shots have auto-lock-on, meaning that provided they lock onto something it's impossible to miss.
Although it is possible to lock-onto something you didn't want to shoot and hence not hit what you wanted (In some scenarios this is quite common...)
Each standard skill shot also has a fixed RoF, fixed base Crit Dmg (of 100%), and fixed weapon Compatibility [of 245%].
Whilst using her standard skill, Turbo kneels down to fire. In some rare circumstances, this can allow Turbo to avoid being hit by just having enemy shots go over her head.
Using her ult fires a single shot that deals AoE damage.
The more Supercharge consumed, the more damage it does.
Note that Turbo will slide to one side as she fires her ult, which can throw your aim off by quite a lot.
If in ADS, she will instead slide forwards or backwards, which can make aiming much easier.
Her ult does also knock targets into the air, which can be used to perma-stunlock non-bosses.
Her ult not having a fixed base Crit Dmg and Compatibility means it benefits less from crit mods, which tends to mean it deals quite a lot less damage than her standard skill.
As such, her ult is only worth using against large groups - for three or fewer targets her standard skill will always outperform her ult.
Further note that Turbo's ult isn't actually classifed as a shot - it's a skill.
With its Neuronic, it benefits from ballistic buffs though, but it's still not a shot, and hence doesn't do double damage to shields, or benefit from any other ballistic-related effects.
This includes things like the per-shot Frost damage of Tess - Phantasia's Support Skill.
In practice, since her ult is an AoE, you will only use it against groups, where your ballistic buffs are the only thing that matters, so in practice being a skill doesn't really make any difference for most content.
Note that Turbo's standard skill gets such massive buffs that even against groups you're often better off using her standard skill than her ult.
Many of Turbo's Manifestations buff her standard skill only, or buff her standard skill more than her ult, so the more Manifestations Turbo has the better her standard skill becomes relative to her ult.
Turbo has a Neuronic that allow her to recover Stamina after shooting with her standard skill and ult.
Even with these, Turbo will eventually run out of Stamina unless she has her signature 5* weapon.
When Turbo runs out of Stamina, her dps drops off a cliff, as without her stamina to fuel her Supercharge she can only fire normal shots.
These will still benefit from her ballistic buffs, but otherwise are quite poor.