Kathi Lee
From Fanonpedia
Kathi Lee is Diantha's manager. She's a control freak with a pretty short temper whose favourite things are safety, schedules, and punctuality.
A certain Kathi Lee is a universe-hopping Malva's assistant (though she gets annoyed when referred to as such, as she prefers to think of herself as still being in charge). After Malva's defeat, she offers to manage the War Champions, but is declined. She starts looking for another job somewhere else, and ends up frequenting War Staryubucks.