Grace Wain

Grace Wain is a character who was first introduced in The Tenuous Takedown of the Tyrannical Teachertrons, replacing Melvinborg as the superintendent of Jerome Horwitz Elementary School. In The Taxing Trauma of the Treacherous Tattle Trials Part 2, it is revealed that she is actually a future version of Erica Wang, who time-traveled to ensure her child self's entry into Eliteanati Academy.

Trivia

 * Grace Wain is an anagram of Erica Wang, foreshadowing her true identity.