Monster character referenced in billy bat

That's what happens when you read monster and billy bat back to back 😭. Had read 20th century boys and Pluto previously am so tempted to reread them. Love his way of drawing and his storytelling.

Edit: Yes the character is the baby too much to expect from people on reddit to get a simple reference but it is what it is. The comments are funny seems a lot of you didn't see the tag or actually read or watch the series.