According to Tumblr's Year in Review, these are the most reblogged ships of 2015.
1. Larry Stylinson
Harry Styles <3 Louis Tomlinson, One Direction
2. Dan and Phil
Dan Howell <3 Phil Lester, YouTubers
3. Destiel
Dean Winchester <3 Castiel, Supernatural
4. Olicity
Oliver Queen <3 Felicity Smoak, Arrow
5. Captain Swan
Captain Hook <3 Emma Swan, Once Upon A Time
6. Korrasami
Avatar Korra <3 Asami Sato, The Legend of Korra
7. SasuSaku
Sasuke Uchiha <3 Sakura Haruno, Naruto
8. Clexa
Clarke Griffin <3 Commander Lexa, The 100
9. Stucky
Steve Rogers <3 Bucky Barnes, Captain America: Civil War
10. Hollstein
Laura Hollis <3 Carmilla Karnstein, Carmilla
11. Bellarke
Bellamy Blake <3 Clarke Griffin, The 100
12. Johnlock
John Watson <3 Sherlock Holmes, Sherlock
13. J2
Jensen Ackles <3 Jared Padalecki, Supernatural
14. Swan Queen
Regina Mills <3 Emma Swan, Once Upon A Time
15. Ereri
Eren Jaeger <3 Levi Ackerman, Attack on Titan
16. Sterek
Stiles Stilinski <3 Derek Hale, Teen Wolf
17. NaruHina
Naruto Uzumaki <3 Hinata Hyüga, Naruto
18. Ziam
Zayn Malik <3 Liam Payne, One Direction
19. Narry
Niall Horan <3 Harry Styles, One Direction
20. Klaine
Kurt Hummel <3 Blaine Anderson, Glee