Sinclair used to be a wishy-washy, overdependent, inexorably insecure but kind-hearted young man who has a fear of uncertainty & is a timid, introverted person. After becoming the leader of Los Mariachis, he's learned to cope & express his feelings through music and dance. His anxiety & uncertainty aren't fully gone, but music is at least helping him be more confident & less anxious all of the time. Surrenders to the rhythm when he's fighting, he's calm and semi-confident when he isn't anxious.