I'm just gonna say this right now. the first season sucked. But the second season isn't bad so far. I really like Yin-Yang (though they got it backwards; Yang means good, so Yang being the evil side is... wrong.) and all the BFDI/BFDIA references like Nickel talking to Announcer or Puffball's Speaker Box being a judge for the pizza competition.
I don't have any strong feelings towards any of the characters yet, but that's probably because most of the character development starts to kick up in the later half of season 2 and I've only watched up to episode 7 of season 2.
In any case, excited for what will happen.
Not in my top 3, but that might change.

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A Comprehensive List of all Object Shows I've Watched and My Opinions of Them
RandomYou read the title :) My top 3: 1. BFDI: The Power of Two 2. Inanimate Insanity Invitational 3. ONE