He gets a little freaky on stage and has a skipping/jumping dancey dance. The band all have black paint/makeup to cover your skin and wear cool masks unique to Sleep Token. 

the band's frontman, has experienced trauma. While the exact nature of the trauma is not explicitly stated, it's implied in the lyrics and themes of their music. He also goes mute sometimes. Sleep Token's songs often explore themes of loss, grief, depression, self-harm, and toxic relationships. 