@FearUS
Eh they are pretty in character IMO :
1) Connie : His action is believable and not so out of character. Like he says it himself, he's tired being betrayed and losing people who matter to him, and when there's an opportunity to save his mother, why wouldn't he take it? He may a goofball, but that doesn't mean he is only that, nor his character can't evolved from that.
2) Grisha : I'm not too sure why you've shown Owl speaking to Grisha vs Grisha having to be pushed to steal the founding titan. The former is merely Owl telling his mindset, it's not Grisha own mindset. The latter, Grisha has his own moral that he's gonna violate, killing Eldian (whom he swore to save), killing children (pretty self evidence), and if I recall correctly, Grisha never killed anyone from that point. You're asking him to do actions which is counter to his moral, in cold blood, instead of a decision in a split decision, so it isn't easy for him. Having a family to save doesn't always make the decision easier.
3) Mikasa : Well I'm not too sure about her, I would have thought she gives priority to Eren, but I guess she's not too on board with Eren's action and prefer to side with Armin. Still she looks visibly torn so she doesn't looks totally set yet.