What if you wake up with new set of memories? What if you learn that your family supposed to be from fictional story with you not existing? What is you gain a system that allows you create a quest and give you reward? Haruto Yuki find himself in this exact same scenario. Series: To Love Ru, Kengan Ashura, Baki, History Strongest disciple Kenichi, Etc. This story has mix world and the power scale is according to me. if you have complain then read the original. I will try to make him Strong but not too Op.
keep up the good work, let there be development, etc. No need to rush. But since this is a harem, we are waiting for the corresponding chapters))) Oh and also since this is a cartoon in an ordinary world, I suggest crossovers with ordinary worlds from Nickelodeon such as iCarly, Big Time Rush (you wrote about the songs yourself, then there is an opportunity with group songs), and also if Lincoln goes into acting, I suggest a crossover with the cartoon series Victoria the Victorious.