Betty Butterfly
Betty the Butterfly was a resident of the Great Forest who found Sonic the Hedgehog as he wandered into a patch of Poison Sumac Blossoms and went through a particularly gruesome reaction. Afterwards, she flew by as he returned to Knothole after the defeat of Pseudo Sonic. (StH: #9)
She later made a brief appearance in a flashback to the event with Pseudo Sonic while Sonic was using one of Robotnik's inventions to see into the past. (StH: #57)