TotOS's sequel series, or even spinoff, one may call it.

Will is a...Will O' The Wisp. I think in her previous life she was an insect of some sort. Now, she's a fire spirit.

Will is energetic and playful, somewhat childish. She's always looking for someone to play with. After pestering Peter and Co., she decided they were amusing to her, and chose to follow them around.

Not much else is known about her at this time.