It was a piece of clay that fell off of him and changed into a girl and got amnesia or something so it thought it actually was a little girl
Also I think that's just a drawing of batman characters, not necessarily BTAS characters. Since Cassie Batgirl and Hush weren't in the show, and Catwoman & Ra's are in different costumes.
I'm pretty sure in the animated series he could look like normal people, probably just one of those things like Joker killing Bruce's dad in Batman 89.
I considered that, but the girl doesn't have red hair and Barbara is already represented as the Batgirl standing on the Batmobile...who is this mystery girl? Anyone got the number for the Bat-phone? This looks like a job for the world's greatest detective!
Edit: Putting together a list of possible suspects: Sondra Fuller (4th Clayface) Talia al Ghul Linda Friitawa (Fright) Christina Chiles (Cyber Cat) Jane Doe Lady Elaine Marsh-Morton (Lady Vic) Nora Fries (Lazara) Madame Zodiac Margarete Pye (Magpie) Camillia Orton (Mime)
Also I think that's just a drawing of batman characters, not necessarily BTAS characters. Since Cassie Batgirl and Hush weren't in the show, and Catwoman & Ra's are in different costumes.
Edit:
Putting together a list of possible suspects:
Sondra Fuller (4th Clayface)
Talia al Ghul
Linda Friitawa (Fright)
Christina Chiles (Cyber Cat)
Jane Doe
Lady Elaine Marsh-Morton (Lady Vic)
Nora Fries (Lazara)
Madame Zodiac
Margarete Pye (Magpie)
Camillia Orton (Mime)