I wanted him to become like an elder guardian for the Guardians. Imagine someone from Easter suddenly meeting him (like the one with Kairi), he would have a "If you plan to get Himamori-san in trouble… you'll have to get through me first" kind of chara. But hell no, he totally dropped out of the plot, ignoring the fact that he still sees Shugo Charas floating around, and he has this annoying happy smily attitude. Even when he met Kairi, he's all genki. Makes me think that whatever evil stuff Easter has in mind isn't too evil.

And now I look at Kairi's sister. I expect her to be the freaking same thing. Totally out of the Shugo Chara plot to be a mere genki manager to Utau.

Good you pointed out the upcoming filler. They give us a completely fulfilling ending with episode 43, and the trailer for the next ep then shows some off-beat theme.
> Nikaido
What? did you miss episode 2x? Anyways, I like how Suu (?) and Nikaido pair up.
How about the first the old Chairs, that Japanese-y girl and the sport boy. I know the latter got chara-nari'd, so maybe that's it. And how come Kairi's sister can see shugo charas?
> Utau
After that last ep, I actually don't expect Utau to ever show up in the anime again, just like Nikaido.
Maybe the last arc for this year will be about the humpty lock and key. I really want Ikuto and Amu to get together, though I doubt it.

At least we can look forward to more Amu and Utau awesomeness in a future episode. "I'm Utau's manager!?" is a filler I have high expectations for.

And just the one final note…Seraphic Charm is indeed awesome (fillers with Seraphic Charm is also necessary!!!)