Board Thread:General Discussion/@comment-12036244-20160813193200/@comment-12036244-20160816160819

~AncientAmber~ wrote: I'm sorry, but there is absolutely no way they are adults. The overworld sprites are often pretty disproportionate, so don't trust that. Chara's and Frisk's sprites are equally as tall as Asriel's and Monster Kid's, who are obviously children, and shorter than adult monsters we see around.

Besides, why would they be unable to tell the difference between an adult and a kid? Monsters and humans have lived together for a long time (possibly), and Chara fell down not long after the monsters had been trapped Underground.

Not only that, but according to the tapes, Chara had a childish behavior, such as being unable to differ buttercups from cups of butter (even though this could have been intentional, but we don't know yet). And Asriel would have certainly noticed it if Chara was an adult. Their behavior and actions tell much about that. Monsters just can be in overage bigger, than Humans. Sans may be short by Monster standarts, by actually about the size of the regular adult Human.

And it's unknown, how long Monsters were sealed Underground, so they just could forget the difference between human child and adult. Remeber, that Rabbit, who owned shop in Snowdin, didn't even recognised Frisk as Human? I have mentioned that before. As well is unknown, how long time has passed since Chara died. It's possible, that skelebros, Undyne and Alphys didn't even were born before Queen left.