[MisaoFan]

Here's mine :

Sasha and Mafuyu (Seikon no Qwaser) : The pairing happened because they ended up together at the end of season 1.
Naruto and Sakura (Naruto) : They make an attempt to pair up each other, but failed

Spoiler for Spoiler for NaruSaku:

because of bad confessin Sakura made it for Naruto. The love triangle's problems between Naruto, Sakura and Sasuke continues to involve with even more drama.

Issei and Rias (High School DxD) : I heard in some random LN thread as well in Wiki

Spoiler for Spoiler for IsseiRias:

that Issei made a confession to Rias and they ended up together despite Issei's supposed death in volume 11.

Tori and P-01s (Horizon on the Middle of Nowhere) : They end up together in the first arc.

Shikamaru and Temari : I despise the fact that they end up together

Spoiler for Spoiler for ShikaTema:

since their fight at Chunin Exam Arc

. I wish Shikamaru would end up with Ino instead of Temari.