Can't Figure Out What Anime This Is?

alright so there was an anime when i was a kid (approx. when i was 12 and im 22 now) and it was about how any character (whether it be the main character or not) could transform by eating a fruit and all i can remember of it was that there was a mountain and inside was a character that had just ate a fruit and was transforming and after they transformed they was giant monsters and or beasts. the fruit was kind of like a power up for them. oh and if i remember correctly it had a japanese or

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