He wasn’t raised by his father. Actually he spent part of his childhood in an infamous child abusing cult, so it’s really not fair to associate his family with his character.
He isn’t a fascist. The combination of the (likely politically motivated) rape allegations and leaking of Clinton’s emails meant he was abandoned by the left, so that his support base consists of crackpots, libertarians and PMC radlib types united only by free speech brainworms. Whenever I’ve heard Julian speak he’s sounded fundamentally left wing to me, albeit not in a Marxist sense obviously.
I doubt he’ll involve himself in electoral politics. Apart from likely being extremely burnt out an d traumatised, he already tried to start a Wikileaks party in Australia years ago and it never really went anywhere.
As for the allegations against him, (which is the only meaningful criticism against him that can be made), it’s worth bearing in mind that he always said he would willingly go to Sweden to fight them in court, so long as he received assurance that he wouldn’t be extradited to the US. An assurance Sweden always refused to give.