Nini

A backline that has multiple forms of debuffs ranging from freeze, burn, silence, and reduce magic res, Nini is a great choice for DOT comps to stack multiple debuffs on a target. Her artifact also has an interesting effect of increasing the damage of Nini’s auto attacks upon 6/5/4 stacks (in ascending rarity).

Her strongest synergy would be M1 with S3, which automatically regains 300 mana every 2 seconds permanently, as well as a small heal. This allows her to have a good uptime on her double status effect freeze and burn on her M1 (note that she applies both, not freeze OR burn like the in-game description), which already lasts 12s. S1 reducing target’s magic res further amplifies her own M1, as well as Violette’s M1/ult since you are almost always going to run Violette with Nini. 

Her kit in general looks decent as a DOT applier, but she suffers from a lackluster artifact that ironically strengthens her basic attacks instead of M1 or subs dealing magic damage.

Her silence would have been a great kit, except it targets the nearest enemy and not the one with the highest ATK, which should be the priority of delay since frontline M1 is far less impactful than backlines.

Single Bosses

She has a great synergy with Violette comps to apply DOT and support the faction bonus.

PVP

Nini is rarely seen since undead comps are not common, and DOT teams are really weak against multiple enemy units since the debuffs applied are likely not focused on a single unit.