Princess shroob is a princess of all shroobs and
the main antagonist of M&L:PIT she wanted peach's castle in past time!...Mario and luigi and their baby form finally defeated her!..She appeared as cameo in M&L:BIS in shroob's battle!...However she didn't appear in MBAV...but it's confirmed she will escape when she was freezed for unknown reasons..
This Princess has ordered Shroobs to take Princess Peach's Past Castle because she has a new one!..
It's Really Possible she will team up with Dr.Zomboss This time in future