If you're planning to use a certain character withing a range allowed by its usage conditions, you don't need to obtain permission from the creator in order to utilize a model. However, you can contact the creator in case you wish to inquire about additional details about usage conditions etc.
As we currently do not offer a messaging function on VRoid Hub, please contact the author directly via their contact information, such as their social media handles on their page.
Please make sure to use all characters as laid down in our Guidelines and Terms of use, and in ways that do not cause any damage to the creators.