Animating and customizing characters in Roblox, which mimic the creation of human-like figures, can be a concern in Islam. Creating images or animations of living beings is generally discouraged, especially if it involves mimicking Allah’s creation. Moreover, some games may include elements that are haram, such as music or images of living beings, making them impermissible.

Games that do not involve anything haram and do not lead to it are generally permissible.

And Allah knows best.

Sources:

• IslamQA
• Islam Stack Exchange