Replying...
Intro. Mask is a Masky in the other timeline, he is a younger and stranger Masky than the original. He is a weird rookie proxy in the Slendermansion mansion. His real name, like Masky, is Tim Wright, although Mask is stranger than Masky. Masky would be colder and more genocidal, while Mask is just mute and strange, not knowing his intentions. Because he is a rookie proxy, he works for Slenderman, not in terms of murder but in terms of fixing Slendermansion. When Mask kills someone, he becomes anxious... feeling disgusted and nervous, having to take his pills to calm down from the crime he committed. When Mask is almost dying or someone kills someone important to him, he enters insane dismemberment mode, being able to dismember the one who caused his fury.

Mask

@Marítima