From description to reference sheet
Open the cast library and describe your character the way you would to an artist: age, build, hair, eyes, a defining detail, the expression they wear most. Give them a name, because that name is how scene beats will refer to them. The studio draws a front-facing portrait in the site's cel look and saves it as the character's sheet. If the first draw is not quite them, draw again with a sharper description; each attempt costs the same three credits.
Outfits are separate sheets, so your OC can have a school look, a festival look and a battle look without three different faces. Props are sheets too: the broken umbrella, the relay baton, the notebook they never put down.
Putting them in a scene
A take is a single continuous shot with up to three characters in one set. Write what happens in two or three sentences and give your OC one spoken line in quotes. Choose a voice style for them from sixteen anime-delivery tags, such as earnest, deadpan, hot-blooded, soft-spoken or villain purr. The tag is a description of how the line should be delivered, not a recording of anyone; it shapes the performance in the render.
When you render, the sheets for your OC, their outfit and prop, and the set are attached as references, so the engine draws the same person you designed. The anime scaffold is added around your beat automatically, including a guard against on-screen text so the engine does not invent subtitles or signage.
From scenes to a show
One take is a nice post. A show is better. Create a show, attach your OC and the friends and rivals you have drawn, and start numbering episodes. The draft button writes beats using only the names in the cast, so your OC stays the lead. Stitch two to four takes behind a title card and the episode is done; make it public and it appears on the show's own page.
Because every character is a saved sheet, an OC you made for a rooftop romance can turn up as a cameo in a friend's fantasy show later, or in a crossover episode of your own.
A note on faces
Characters are always drawn in the studio and never uploaded. That is deliberate: the video engine accepts faces it can trace back to a drawing it recognises, so studio-drawn sheets render reliably where uploaded portraits often fail. Sets, outfits and props can be uploaded freely.