Like Shinobi said, that's Kakihara, lately a yukkuri artist has been using him as his main character, killing off shitheads while keeping 2 nice reimus and a remirya as his pet.
If by character you mean the person holding the giant wooden sword, his name is Guts, from the series Berserk, a manga that has been out since the 80s.
My guess as to why Conjoh uses this character is because Berserk has been made into a three part animated movie not too long ago.
Here is the thing, it's obvious it's a parody to Berserk and Guts, but the character itself is a "Gutsfied" version of Kakihara, you can tell by the scars he has in the eye and mouth, and the fact he still have BOTH eyes, Guts only have 1 eye remaining after "the incident".
Kakihara had been done a lot lately as part of the yu fanworks, one of his most well known yu stories is the one he deals with a family of farm raiders but adopts the surprisingly smart and niceheaded premature reimu.