I don’t currently have the time to watch the full episode, but I skimmed through it a bit. I haven’t seen enough to see much about Myne’s animations other than that she might be acting stiff due to (spoilers) >!entering into noble society!< Aside from that I don’t know what you’re talking about with Ferdinand being apparently fat. He looks just as fit as most any of the other male characters appearing alongside him.

Which season? From what I’ve heard Seasons 3 and 4 are significantly higher quality than 1 and 2, but I haven’t seen them yet myself to vouch for that.