In Anime
In the anime Yu Yu Hakusho, when Yusuke, Kuwabara and Botan go to rescue Yukina, Kuwabara points the way, claiming that his fate and Yukina's are interwined by a red string.
In InuYasha The Final Act, during the first ending, With You by AAA the characters Inuyasha and Kagome are shown with a red string attached to their pinky since they are destined to meet.
In the Naruto series, Kushina Uzumaki claims her red hair became her own red thread of life that eventually linked her to Minato Namikaze.
In the anime Tenchi in Tokyo, the goddess whisks Sakuya and Tenchi away to a café for a romantic moment together. Spotting her opportunity, the love goddess tries to tie Tenchi and Sakuya's fingers together with the red string of fate.
In the movie Case Closed: The Time Bombed Skyscraper, Ran Mouri answers why she did not cut the red wire to disable the time bomb because she and Shinichi Kudo are connected by it, referring the red string of fate.
Read more about this topic: Red String Of Fate