Younger Characters

The more specific one's request is for certain character traits, the more likely it is that filling the request will require licensing characters from a company that focuses on that service, buying images from a stock photo agency, or even paying for a custom photo shoot.

Here are two sites that provide cut-out characters:
•    https://elearningart.com/ 
•    https://www.elblearning.com/create-learning/asset-library/cutout-people  

Note: Cut-out characters from other sources are put into Storyline via Insert > Picture (not Insert > Character).