(Edited a little later) I rate this a 1 / 10.
Note, I'm an adult male with multiple interests, I watch "My Little Pony: Friendship is Magic"; "Alvinnn! and the Chipmunks"; and "Littlest Pet Shop: A World of Our Own", and I think "Unikitty" is pretty ok, has moments to be enjoyed. So I decided to give this a shot.
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Rainbow Butterfly Unicorn Kitty is about a cat named Felicity living in a magical land filled with anthros and creatures and beings of typical legend like dragons and leprechauns. The show is mostly summarized in fast-paced, blinding colors clearly intended to just keep kids distracted. Its a mashup of "SpongeBob", "Amazing World of Gumball", "My Little Pony", "Unikitty", and (shivers, bleh) "Teen Titans Go!", with stolen elements from all of those.
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I never actually thought I would see a Mary Sue main character on a show on national television trying to make money on a major network. In the first episode I saw, Felicity is trying to come up with an act for a talent show. She flies, unzips into different dimensions, warps reality, produces cartoon physics, can create a light show spectacle out of her paws, conjure magical items, is overwhelmingly positive, beloved by almost all the residents of this universe, easily protects the world without effort, she can make music, improvise, and more.
Meanwhile, her blue dog Chihuahua companion named Miguel, is having writer's block on trying to sing a song. He's very clearly struggling and stressed while the cat Felicity is performing multiple stunts and her only problem is basically indecisiveness because SHE'S TOO TALENTED!
Another episode featured a leprechaun who, after Felicity controlled the weather to blow the clouds away and created a rainbow, shows up to find no pot of gold to guard. So Felicity take him all over the city trying to find a job he can do. Turns out SHE CAN FIX EVERYTHING and clean up after his mess with impossible homing abilities and conjuration. The animators seemed to have tossed in a lot of older cartoon concepts with newer ones in a chaotic mess of a chase scene that made little sense, and an ending that made even less sense.
It's not a good thing when you guest character's main problem is being grossly overshadowed by the abilities of your main character who seems to have fixes and solutions to every episode. Walking through a land of food temptations sprung up by a magical forest, she was the only character who not only resisted easily, but was able to take a piece in her mouth to trick an enemy while all the other characters succumbed to their flaws. She also seems to somehow taken over the brainy expert of the group with no problem, completely neutralizing the necessity for any teamwork.
With Felicity having such an abundance of powers and abilities, it opens the episodes to a lot of plot holes.
On the surface, it seems that "Unikitty" would also have some of these problems, but Unikitty's abilities are balanced by her bubbly attitude creating more problems than solving.
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It still has some potential. The world and supporting cast is actually kind of interesting, even if a little simple. If the title character were more like "Earthworm Jim" and "The Tick", having overwhelming powers but enough character flaws and social issues that can balance it out, or at least "Kim Possible" where her abilities are toned down and she struggles against her problems, or she applies them incorrectly for humorous effect, the show could work really well.
Originally I rated this a 3/10 for it's potential and artwork, but the show never capitalized on it's worldbuilding.