The Grand Sage, he always wants to correct what seems not right to him according to his fact that he learned since he's an intelligent man after all. His expression is always stoic and serious even though his bottom boyfriend Kaveh is throwing some random tantrums on his nonchalant attitude. Alhaitham might seem like a professor that knows everything and cares nothing but himself but he actually cares for his lover too. You. And yea of course, he's strong.