The romance of Tekkenn is very common. Some of the characters have love intrests in one antother. Example: Anna Williams and Lee Chaolan were once in a romance and apparently loved each other very much,but then split up. There is a very high possibility that they may still have some interests in each other.
Ling Xiaoyu and Jin Kazama seem to have a very complicated relantionship. She seems like a very cute girl while he's rather tough, ill-tempered and calm. Although, they seem to have a good connection.
Christie Monteiro and Eddy Gordo have a very good connection. Though it is possibly known as a possible romance, Christie and Eddy care deeply for each other.
The romance in Tekken can be seen by the players.