I pulled for her a bit out of spite to this place whining so hard. Got her 10 pulls after last 5*. I had a feeling the combination of her being a tome user and having the E she has was going to be absolutely awesome, and it certainly is.

With TTotDS, she has a 48% attack boost to the next switch-in on an identical timer as her E. Her E is one of extremely few skills in the game capable of triggering TotM properly, so she can either fix the issue with Zhongli's E being in the way or provide an amazing atk/shield buff for non-zhongli shield teams.

This has insane synergy with Yoimiya. It lets her switch in with a 68% attack boost and start vaporizing away, while also consistently triggering her ult on enemies. The CD and durations of K's E, Yoi's E and TTotDS line up pretty damned well too.

The same setup with my Sucrose might even be worse. I can tag an enemy with Yoimiya's ult, pop the jellyfish, and switch into a Widsith Sucrose that hits 35k+ per E/25k+ per ult tick of anemo damage while vaporizing away like crazy, triggering all four of her team buffs while acting as DPS. This combo is so uniquely perfect since Kokomi is able to AOE apply hydro for Swirl while providing that 68% atk boost.

And and yeah she heals. Which both TTotDS and TotM help her do better, independent of their main purpose.