Alex appears rather sullen and grim, focusing mainly on finding his missing brother Joshua
he can be very stern and direct to people who frustrate him, especially when they refuse to give him answers or try to lie to him.  Alex has 'perspective' and he could talk about anything with her for hours.

Due to being admitted to a mental hosptal for 4 years, it is known that Alex possesses a mental illness of some sort, likely one resulting in delusions