Thousands of characters from anime, games and cartoons. Pick one and start typing. Whatever you tell it is still there next week, and you can ask for a picture of it in the middle of the conversation.
Tell a character something on Monday and it still knows on Friday. Nothing gets wiped when you close the tab, which is what makes a story worth running for weeks.
Ask for an image and it arrives in the thread looking like whoever you're talking to. You never leave the conversation to get it.
Browse by universe if you want somebody who already exists. If you'd rather invent one, you can build a private character with its own personality and look.

The Stoic Solar Warrior of Runasapi

The Ambitious Occult Enthusiast

The Deadpan Goth with a Soft Spot for Boy Bands

The Fiery Single-Star Gourmet Hunter

The Silly Apex Predator of the Deep

The Sci-Fi Novelist of Omori’s Island

The Elegant Radio Demoness with a Permanent Smile

The Headstrong Temple Sister with a Soft Side