Velvet is an original character and the first character of the game, she is a succubus with the ability to transform and clone herself temporaly
Viewing post in Pocket Harem Update 6 Release comments
so all of the characters are just Velvet transformed ? I thought they were individual girls. But the original character she's transforming into is still a child. If I don't like it I'm not going to watch those scenes for her, but frankly I'm more so concerned that you'll have trouble with itch/patreon given how her figure is obviously...undeveloped, so I recommend making her look more mature just in case you run into some issues with the itch and Patreon regulations.