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Shiki the same one who faced Garp and Sengoku 2 VS 1, who was Roger's rival and whitebeard being subordinate to a blackbeard who is much much weaker than him[img=faceslap][img=faceslap][img=faceslap]
You should change the name of the fic, it is very misleading, Shazam does not need a system to become strong, rather training to learn to control his magic, strength and speed, not giving him powers, he will soon reach 500 chapters and he will not have them complete
The scale of power here is completely absurd it's like the story of a completely random ninja in One Piece [img=faceslap][img=faceslap][img=faceslap][img=faceslap][img=faceslap][img=faceslap][img=faceslap][img=faceslap]