Adam Milligan

Like Sam and Dean, Adam is tall and wears layers of clothes. He stands at about 6'0 to 6'1, with dark blonde hair and strands of lighter blonde. Adam has short hair, like Dean. Unlike his siblings, his eyes are blue.

Adam is a lot like Dean. He is very sarcastic, sometimes rude, and laid-back most of the time. He even uses some of Dean's sayings such as "rat's ass" and "unbelievable" and "son of a bitch". He could be a "ladies' man" like Dean, however his attention to remembering his prom date's name suggests he may be more sentimental like Sam. Based on the fact that he graduated honors in high school and was taking biology and studying pre-med at a university, like Sam, he may also be very intelligent as well.

He is shown to hold resentment towards his father John for never properly being there for him, yet he voices that he would have liked more of a relationship with him, to Sam. He was slow to warm up to his half-siblings, even stating neither of them were his family. However, he did seem to take their words about the angels into account when talking to Zachariah before realizing they were right. He was also surprised that they cared so much for him and that they'd actually tried to save him from Zachariah, calling him family despite his treatment towards them.

Unlike his brothers, Adam was more accepting of fate and destiny as he was very willing to say "yes" to Michael even knowing that his fight with Lucifer could be catastrophic, something not shared by his brothers.

Following his time in Hell, Adam is shown to retain much the same personality as before he fell in. Though angry with his brothers for abandoning him, Adam also recognizes their good intentions and isn't willing to dismiss their claims, taking them seriously instead. Due to his time with Michael, Adam stands up to and even argues with the archangel without hesitation, something Michael responds to. Adam is even able to get Michael to admit the real reason for his refusal to believe the truth while Michael appears to be somewhat protective of Adam, angry at Dean in particular for abandoning his brother in the Cage while allowing Lucifer to go free. When Dean apologized to him, Adam stated that no one gets what they deserved before accepting Dean's words with a smile and parting on good terms with him.