In episode 2.5 he didn't have a scar. He came back on episode 6, and then there it was. He also wears gloves always. Dan also has a short temper. One time AGK told him to be quiet because Jojo was near, and Dan yelled "don't shush me". He also got angry that Andy wouldn't shut up.
He is very rich, as he gives 10K to Andy like it ain't even a problem. His scar no longer is on his face after episode 23, as it's healed by Ashley. He also looks out for Andy, and stopped Guiyii from killing him.
In season 1, he was known to be sort of depressed. He had a scar, and would talk in a sad way. Perhaps mainly due to Gavin messing with everything. In season 2, he sort of changed character. He became much more rude. He insulted Herbert for being old. Things began to change in (S02E04), as he tried to chill down his anger. While at it, he theorized Brianna was dead, so he started to date Ivy.