|Synonyms:||Big Guy, Little Guy|
|See also:||yaoi, seme, uke, slash tropes, The Smaller Man|
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The height rule claims that the taller partner in a yaoi or slash relationship tops, with no regards to the characters' canon relationship or personalities (an exception may be made for blondes). Some fanwriters and fanartists will actually make a character shorter than they are in canon, so that their pairing of choice follows the height rule. 
The height rule is one of the common seme/uke stereotypes in fanfiction, often found along with dark and blond coloration for the seme and uke respectively. It has been suggested as the clearest physical indicator of seme and uke roles, as well as a 'feminizing' of the uke partner, as a holdover from idealized heterosexual relationships.