Brian Danielson

Husband of Daria's cousin Erin (do not confuse with Brian Taylor (character)). He apparently once worked in government intelligence, though in what capacity is unknown. He did not have his job long, however - possibly because Erin liked telling everyone what Brian did for a living - and was fired after his honeymoon. It is possible he was a CIA operative, though a more believable post would have been with Iraqi Freedom) - there is also the possibility that he was outright lying about it and had another government role.

At some point, before (or possibly during) his relationship with Erin, he contracted herpes from an unknown partner.

In Season 5, his marriage was breaking down and it came out he was living off Erin's salary while studying for a real estate exam, that he'd got her to sign a pre-nuptial that'd give him 50% of her assets if there was a divorce, and that they'd only gotten married because he'd given her herpes and she felt nobody else would want her. Erin wanted a divorce in "Aunt Nauseum" but Brian was able to talk her out of it after flying to Switzerland and they had a second honeymoon there. (It is often assumed by fans that Grandma Barksdale paid to send him there, to keep the couple together)

Brian's last name was not revealed with precision in the show. It appears from the way Daria referred to the wedding in "I Don't" that his name is Danielson, as the bride's name almost always comes first in wedding announcements by convention. In some fanfics, Brian is known as Brian Chambers.

Rita Barksdale really hates him.

Brian in fanfiction
In the fanfic It's All About Respect, the alternate-universe version of Brian is Alfred Brian Chambers IV; during the course of the fic, he is severely injured and mind-wiped by Colonel Franklin Davers, who was under orders to kill Brian for hhis traitorous actions (as a former member of the government group known as the Domestic Operations Agency. However, Franklin determined that the mindwipe and is injuries would render Brian unable to cause any more harm.

In the John Lane series, Brian appears in alternate versions of "I Don't" and "Aunt Nauseum". In the latter, unlike canon, Erin turns up in Lawndale and a drunken Brian pursues, leading to him getting flattened by John Lane and Jake.

In the God Save The Esteem series, Brian and Erin move in with the Morgendorffers; as he's clearly not studying for his real estate exam, Daria forces him to do so.

Information on Brian Danielson

 * Brian Danielson at Outpost Daria