BL in comics typically depicts love and affection between male characters. It often explores themes of romance, drama, and sometimes erotica. The stories can vary from sweet and innocent to more intense and passionate.
Kickass had a mix. Certain key elements were in line with the comics, but there were also additions and alterations. It's a matter of personal perception whether it was truly close.
Well, BL in comics means Boys' Love. It's a category where the main theme is the love and interaction between male characters. It can involve various levels of affection and storylines centered around that.
Preacher is known for its relatively close adaptation to the comics. It does a good job of translating the story and characters from page to screen. There are a few changes here and there, but they don't significantly deviate from the source material and still manage to retain the charm of the comics.