No, it's just how nooraki makes his anons. They tend to have this weird look in their face, but i think it's just noraaki not being able to draw humans that well.
YuooooooooooYuuuuuuuuuuu!Listen to what Marisa has to say!Mister human!Die!! (Slurred)Stop it! I'm gonna die! (slurred)Yuboooooooooo!!Now we can take it ea-...Sthop it!!!Weren't we safe!? (Slurred)Whyyyyy!? (slurred)We're saved!The outside!Yuraa!Just a little bit fartherrrrrrr!