This is my personal list of who I believe are the most powerful in the fantasy universes, this is my opinion so please don't bitch at me because Superman isn't in this list, he is greatly overrated in my opinion. Feel free to comment if you agree with my choices and if you disagree feel free to discuss it with me, just please don't flame my choices.
1: The Incredible Hulk: Hulk is strongest there is, end of story. Hulk can tear apart planets with his bare hands and even push them back together. His limitless strength allows him to beat Gods into submission with the most minimal of ease, he can withstand attacks as powerful akin to the galaxy exploding and thanks to his ability to heal any wound near instantly he can come back from blows that would be fatal to most heroes. His healing also allows him to go without oxygen as his lungs are constantly regenerating allowing him to survive underwater and in the vacuum of space for a limitless amount of time. He can also withstand temperatures both low enough to flash freeze everything and high enough to incinerate planets. Seen as nothing but a raging monster to many Hulk has always had the option to turn his back on humanity but he always rose up to defend the very people who feared him.
2: Son Goku: the hero of purest heart and kindest actions. Ever since Goku was sent to Earth intended to be its conqueror he has grown to become the planets if not the universes greatest hero, Goku is literally the man who can break any limit, there isn't a power level he cannot reach and he has yet to find an opponent he cannot overcome. The pinnacle of the Saiyan race he has reached every single Super Saiyan level and was the first ever to reach Super Saiyan level 3 and 4 with his son Gohan being the first to hit level 2. Despite being the most powerful warrior in the Dragon Ball universe Goku is also the most peaceful and fun loving being the proud father of two sons, grandfather to one granddaughter and is also a faithful husband. Thanks to his Saiyan blood he ages a lot slower than humans looking no older than 30 at the grand age of 180. Strength wise he can shatter miles worth of earth but cannot truly destroy a planet with a single punch but his main power is in his mastery of Ki Energy being a master of the Kamehameha wave and patented the extremely powerful Spirit bomb along with the Dragon fist attack.
3: Ichigo Kurosaki (Vasto Lorde form): when Ichigo gave into his inner Hollow and transformed into the fearsome Vasto Lorde he instantly became the most powerful being in the Bleach universe able to carve through a mile of solid rock with a single swing of his sword without it even touching the ground. His speed in the Vasto Lorde form is unmatched moving faster than the eye can follow and his attacks send even the most powerful Hollows flying if not destroy them instantly. His enhanced Cero attack has the force that rivals a small nuclear explosion able to destroy almost any target. Durability wise the Vasto Lorde can withstand explosions that would kill most Shinigami, Hollows and Arrancar alike without any visible damage.
4: Jackie Estacado: being the current host of the Darkness Jackie is arguably one of the strongest beings in the DC universe. At night Jackie is completely immortal able to shrug off normally fatal attacks with complete ease, whilst in darkness his strength is multiplied to the point he can hold a skyscraper above his head without breaking a sweat. Since he is the host of the Darkness, the oldest and most powerful force in the universe having been around since before the universes creation (before the Big Bang there was only the Darkness) he can create weapons of pure shadow, imbue his guns with darkness power increasing their damage output, cover his body in armour so unbreakable that even the mighty Superman or the Hulk cannot break through it as well as summon a never ending army of Darklings from the shadows. He can also increase his speed to near impossible levels and summon wings to grant himself the power of flight.