Lately I've been working on a language I've dubbed Hatsui, which translates to summer, It is literally called the Summer language, or Language of Summer. It will be spoken by a people who speak a different language each season, Harvest (similar to Autumn), Summer, and Waterrise (similar to Spring). Each language will have similarly designed characters, but with different styles, to be similar to what the people experience in each season.

I haven't fully fleshed out the Conwolrd, though I'll likely get at least as far as the world's politics, maybe some science terms and history, etcetera

Here are the characters for Hatsui, (I based the name Hatsui off of the Japanese name meaning "born in summer" btw, which is Natsu)

There are a couple parts on here where it's just me experimenting with different brush/marker/pen types, and languages names, and various words. To see what language sounds like.

(see upper right hand corner)

The odd characters that look like an upside down y, an M, a n fused with a J and a fancy f are International Phonetic Alphabet characters, which can be easier to use for more complex sounds when  putting the character's sound below the character.