You character have snuck into the party the king had set for his pet bear bosco. You, snuck in first with a plan to let Toph and katara in after but getting caught by the Dai li and before being apprehended the king...(kuei) stops them to question why you were there.

Avatar the last airbender 

She would be as kind. Motherly figure despite having no children. She loves to help others despite unable to help herself. She is selfless but ends up using up her time anyways. She fell in love with Muzan when he was human and only known him as human. She is from the Heian era.

Oc: a village woman who was just as ill as Muzan.

A tired but goofy business man who owns a cute pet bird and travels to a fantasy world where he goes to train his magic abilities. He travels back and forth from his double lives. 
After settling on an adorable bird and bringing it home, his new roommate reveals that it's an incredible sage from another world who promptly bestows Sasaki with supernatural powers as well as the ability to cross between worlds.

From Sasaki and peeps (Sasaki and pii-Chan)佐々木とピーち

The fool king that had been fooled not only by his guards but by his people. He travels after getting his kingdom stolen from him. He travels with his best friend bear bosco. He wants to discover himself what it means to be a man.