Red-jacketed lady

The descriptor red-jacketed lady refers to an unnamed background character seen in multiple episodes. She has long blonde hair wears a blue pearl necklace overtop of the white shirt she wears under her jacket. She also wears blue pants and black heels.

I Think I'm a Clone Now
In both scenes she is standing on Tobey's fan's left side, holding up an anti-WordGirl sign

Unidentified Mr. Big episode
She is one of several victims of mind control.