I might just stay away from the OS Facebook page. They are getting so much hate because of Olive and Otto leaving, and people are even going so far as to say they "hate" Olympia and Otis, and "won't be watching any more." One person even whined that "there was already a character named Olympia, and she was so much better." (Also, "gadget-boy is leaving." There's a nickname I haven't heard XD)
I get it, I get it! Olive and Otto were great together, and maybe we'll never get anyone that good again. But at least give Olympia and Otis a chance! There's only been what, three episodes??? Go back and watch some of the first Season 1 episodes, then the later ones. You can see Dalila and Filip getting progressively better, more comfortable, and into character. And if I may say so, I think they ALL did a great job from the get-go. But Olympia's the most adorable thing! How can you not like her? I cannot provide a reason for why I like Otis. I just do. Kid has pretty impressive/expressive eyebrows if you ask me.
Having Oscar train Oona for a while is a good plan, and it means we're not losing three of the Main 4 at the same time. We haven't really seen much of her yet, but she's great too, and reminds me of my cousin, though again I'm not sure why. (And now I can't stop pretending everything's black-and-white and thumping the back of my head.) Oona seems like a female Oscar, sort of, but not like a character copy if you know what I mean.
I thought Oscar was going to be the hardest one to replace. But let's face it, kids grow up! Let's not view the new agents as "replacements" but as their awesome selves.
So there's my rant ended with a motivational sentence. The steam has been let off. *aaaaaah*