As a kid he was calm and kept to himself. He enjoyed music as an escape and usually played while caring for his siblings. After having to protect his siblings from their father, he's been very protective whether he's afraid or not. He's afraid of being separate from them and worries something will happen while he's away. He would drum on surfaces with his fingers, the tempo would change with his emotions. The more he gets worked up, the quicker he gets before he shouts out his disagreement.
His attribute works with his emotions and focus of rhythm and tempo. Since he's a musician his magic works as a metronome. He instinctually protects, as he starts to panic or be filled with adrenaline, the tempo quickens and so does he. It gives a sense of suspense to others similar to a horror movie or video game ambiance. While it's still a work in progress, his magic is not exactly musical but timing.
While when someone is upset, threads can tangle, fray, or flare, Ryker works best under pressure.It could still occur however,he can handle pressure better than others. His magic causes him to be quicker. more precise, and to focus even better when the tempo is quick (though it's tunnel vision). Not only is he quicker, his magic can come out in patterns, "tune" emotional states, reinforce allies, and stabilizes chaotic magic flow. He still has maintain control because there's still a threshold where it becomes too much. He could lose timing and/or get burned out.