
Baron appears somewhere in specials [after season 1, before s2], and in season 2. He's, I suppose, Mono's unrequited love - I say 'suppose', as it is not clearly stated in the story though we're given some hints. He's also Uriel's subordinate, he was a persecutor in Lego's case?, and is now shown in the latest chapter entering Mono's office. The story is getting REALLY interesting...

yeaah, they might've been but as it is the case with Mono, it's not clearly stated that Mon and Baron were lovers. Though there are bits and pieces. Links:
http://www.mangago.zone/read-manga/heaven_hell_roman_company/uu/heaven_hell_roman_company-chapter-27.5/16/
[monday's and monos convo supposedly abt baron]
http://www.mangago.zone/read-manga/heaven_hell_roman_company/uu/heaven_hell_roman_company-chapter-28/24/4
[baron's and mono's encounter in the courtroom + NEXT page! Monday thinking abt Baron!]
Soo...we have Monday wondering about how Baron is nowadays...that is also some kind of a hint
SO there is this strange relationship, love triangle perhaps?, between Mono, Monday and Baron. See chapter 37, first pages, where Mono's thinking about desire and how there was one time when he didn't get what he wanted or something like that. His reactions to Baron, the fact that he chooses the appearence of a child, convos with Mon and his thoughts point me to thinking that he was in love Baron? xD idk if that makes sense
i don't think that Mono's dense when it comes to Lego's infatuation with him, he's rather....hesitant? He's still hung up on Baron, you can see it in his eyes whenever they meet, or his thoughts and turns out Baron might've refused him, he might've been that one 'thing' Mono could not obtain even though he desired it. BUT I really hope Mono can get over Baron, 'grow up' and be with Lego cuz the tension between these two is too much! Lego's weakness to pleasure and Mono's sexiness....TOO MUCH ε=ε=(ノ≧∇≦)ノ