HERE,

Look at the very simple geometry of the characters and at how much they differe to each other formally.

They live in a highly stylized world with most shapes based on rounded squares and very strict color palette.

HERE,

Those characters are built in a 3D program and rendered in a very simple style.

The face features (eyes, eyebrows and mouth are supperimposed in 2D.

Their under water world match perfectly the rubber-toy/rounded style.

HERE,

Kai-lan is a Chinese girl that introduces pre-schoolers to Chinese language and culture and helps kids develop social awareness.

There are 4 animal characters and a grandfather that work with her through the episodes and there are all very good designs

She has the very exagerated proportions of a small kid.

HERE,

The 3 characters are very interesting because of design and behavior.

The kids have supperpowers: the girl creates patterns and the boy can design anything with simple shapes (out of his belt).

The middle character can acll any information to be show on his "belly-screen".

HERE,

Simple and colorful design that corresponds to the very young intended audience.

His worlds matches very good the attention of a little brain.
Look at the white outline that shighlights him form his world.