ChildrenTale is an AU version of Children where all the characters are Undertale characters. There are multiple versions of this idea, the primary two by /u/White_Lupin and /u/BalloonBilly22_.
/u/Bonfim_BR has had a hand in both versions, creating some concept art and helping with plotlines.
Lupin's version is currently in development. The current character roster is as follows.
Daniel & Bianca: Sans & Papyrus
Francis & Charlie: Undyne & Alphys
Michael & Sammy: Napstablook & Mettaton
Connor & Chloe: Asgore & Toriel
Kenny & Poppy: Asriel/Flowey & Chara
Still very much in its early stages, not much is known about this comic other than that Kenny takes the role of Frisk, Micheal takes the role of Asriel, and Sammy takes the role of Chara.