Going to try and keep this as short and sweet as possible.
Since the DOGS verse is practically nonexistent, the vast majority of interactions with this character are going to be crossovers with other series/verses, and OC's. I don't have a problem with either, but if you're familiar with DOGS and notice that during some crossover that some of Heine's portrayal isn't entirely canon, oh f***ing well. Certain aspects will have to be bent or just flat-out broken in order to keep sh*t kosher and keep the story pushing. Don't complain to me, dude. That's just weird.
Then again, if you want a complete canon Heine, you can join my dead f***in' verse and I'll be more than happy to play Heine straight as he's portrayed by Shirow Miwa himself. :)