Terri is the apparent former life mate of Terry who appears in "Retrace-Your-Step-Alizer". They have pink skin.
They were ultimately erased from existence along with Vanbo and Funyulack when the Pretend-O-Deck was turned off.
When in the Pretend-O-Deck, Terri changed their name from "Terri with an i" to "Vanbi, also spelled with an i".