User blog comment:Neetaku/A Think Piece on the Characters of Sasha Blouse and Connie Springer (AKA: Neetaku Rants: Part 1)/@comment-26495049-20170715093853

While I agree with most of your points on character development, you might be misinterpreting Isayama's intentions. I think it's clear by now what role he intends for Connie and Sasha to fulfill. And that is the role of comedic relief. Many literary works have these two characters whose main purpose is to make the audience laugh, to distract them from the seriousness of the plot.

I believe that this was also Isayama's reasoning when he made the decision to not kill Sasha. For a violent and bloody series like Attack on Titan, it's important to provide a laugh every now and then to remind the audience that what they're reading/watching is not real.

The point of Connie and Sasha is not character development and heavy involvement in the story, they are there purely for the memes.