I like all pairings (straight, boyxboy, girlxgirl, threesome, Genderbender), but these are my top favorites (somewhat order).

---------Adventure Time-------------

FioLee/MLxFionaxGP/GPxFiona, MarcelinexPB, MonoxCake, FinnxFP

MLxFinn/MLxFinnxGP/GPxFinn, FPxFiona

FinnxMarceline/PB

------------Avatar---------------

Zutara, MakoxKorra

------------Bleach----------

GrimmIchi

RenxIchi/Rukia, ToshiroxMomo, YoruichixSoi Fon, GinxRangiku, UlquiHime, NnoxNel, UraYoru, ShuJyuu

IshiHime, NnoTes

--------------Blue Exorcist---------------

RinxShiemi, YukixShiemixRin, YukixRin

IzumoxShiemi

----------Code Geass---------

SuzakuxLelouch

--------D.Gray-Man---------

AllenxRoad, TykixAllenxRoad, TykixAllen

LavixKanda/KandaxLenalee, KandaxAllen

---------Death Note----------

LxLight

----------Disney-------------

MickeyxMinnie, MaxxRoxanne

DonaldxDaisy

---------Final Fantasy--------

ZackxCloud

LeonxCloud

--------FullMetal Alchemist--------

AlxEd, HeixEd

RoyxHawkeye

---------Hetalia--------

UkxUS

---------Homestuck---------

Dirk/Brobot/BroJake, Dave/DSJohn, RoxyJane, JadeRose

Bro/DirkJohn, DaveJade, JohnRose, KarkatJohn

DadBro, KanayaRose

----------How To Train Your Dragon---------

ToothlesxHiccup

--------Kingdom Hearts--------

RokuSor, VenSor

RikuxSora+Roxas-AxelxRoxas RoxaxXion, SaixxAxel, KairixNamine, TerraxAqua

--------Kuroshitsuji---------

AloisxCiel, SebastianxGrell

--------Lovely Complex-------

AtsushixRisa

------Marvel/DC Comics-------

SuperboyxRobin

Kid FlashxRobin

------Nabari No Ou-----

YoitexMiharu

-------Naruto------

SasuNaru+Itachi

ShikaTema, KakaIru, KibaHina, NejiTen, ItaDei, Lee/SaixSaku, ChoIno, MinaKush, FugaMiko, JiaTsu, SuiKari

Gaa/KibaxNaru, KariSaku, Saku/TayuxHina

---------One Piece------

AcexLuffy

LuffyxBoa Hancock

----------Pokemon--------

PalletShipping/OriginalShipping/GreenxRed

ComaShipping, CafeMochaShipping

Polishipping, PreciousMetalShipping, ChosenShipping

--------Reborn-------

RebornxLambo/RebornxLamboxColonello, 8059

ColonelloxLambo, 1827/692718/6927

-----------------Regular Show------------------

RigbyxMordecai

--------Scooby Doo--------

ShaggyxVelma+Scooby

----------Soul Eater-------

SoulxMaka

KidxMaka

---------South Park---------

Tweeny, Creek, Creeneck

Stolovan/Tyde/Bye, Stendy

--------Teenage Mutant Ninja Turtles------

Michelangelo/Leonardo/RaphaelxDonatello

----------Vocaloids--------

RinxLen Kagamine

---------Yu-Gi-Oh------

SpiritShipping, YuseixJaden

FossilShipping, PuppyShipping