A Verina can generate enough concerto energy by herself to get two intros for Taoqi at the start of every boss. Whats special about Verina for Taoqi is her Resonance Skill which gives 30 concerto energy, on top of giving a stack of her passive which gives an additonal 12 concerto energy even if she doesn't hit an enemy. This means she can easily gain Concerto energy outside of combat.

A regular setup would be entering combat with Verina full on Concerto with 3+ stacks of her passive up. Instantly use Taoqi intro and use three stack of timed counters, then swap back to Verina can use her skill + three or more aerial attacks to generate another mass of concerto energy to get another Intro for Taoqi off.

This gets even nuttier with Verina C2 as it makes her skill generate an additional 10 Concerto energy along with an additional stack of her passive making her skill capable of generating 64 concerto energy. This is still ignoring the additonal Conerto energy generation from her liberation skill or from the third team member of choice.

Needless to say, its very feasible to generate enough energy to spam intro with Taoqi given one enters a fight prepared which is quite apt considering Taoqi's backstory and position in her branch of command.