Stories with reversible couples, couples with non-traditional top/bottom dynamics, and couples where the position is not relevant to the story (and hard to identify).

For "manly gay couple" some characters may have traditionally feminine traits, but I consider them a "manly" couple because they do not play an ersatz "wife" role in the story. On the other hand, stories with bottoms who are outwardly masculine but play a wife role in the relationship would not be considered a "manly gay couple" in this list.

A "traditional" top-bottom dynamic is primarily defined here as one where the bottom is an ersatz traditional woman. Certain danmei-specific tropes that make a character easily identifiable as the bottom or top could also qualify.

Older brother - young brother dynamics are only considered non-traditional if the shou is also on the more masculine side / clearly does not play a wife role.