Great early game DPS option, good burst damage, extra action is broken but quite limited due to long cooldown. She gets better with dupe and being a standard pool unit it's quite common to get spook by her so maxing her is only a matter of time.
Low movement range without extra action. This changes entirely when her new key comes out, becoming borderline broken getting the extra action every turn.
But that also depends on if you have other water units on the field and the amount of dupes you have. Becomes top tier later on so you won't feel bad about getting her dupes, also boost other water unit value (sabrina, zhaohui, colphne).
V5 is the breakpoint to get max damage out your Tololo, she will get better and better starting from V2, which is also the recommended breakpoint to use her in teams with Springfield.
Effectively a 100% damage boost as now she can get her extra turn every turn when any ally deals hydro damage and if you have Springfield's V1, you can give her 3 actions in a single turn.
A crazy good key and a must have if you want to use her effectively.
