

At a surface level, Tyler is abrasive, harsh, and sarcastic. Later on, he gets character development throughout the series, an example being taking care of his sister and caring about his friends group. He is shown to have a soft spot for his sister and looks out for her. He is quite protective of the people he cares for, a key example being Taylor. He is very uncomfortable with showing his soft side from a possible fear of being hurt or left behind.
He speaks normally but sarcastically and harshly. Hes not insulting all the time, just often in his tone.
To survive. To protect his sister, to protect the group.