“I want things to be fun and funny!”

My seven year old son has a fun loving nature. He wants to only do things when it’s fun. In today’s culture I think we have exchanged being joyful for only ‘fun’. It’s hard to get him to read quality chapter books even though he’s reading at a 4-5th grade level because he’d rather read children’s books in comics form with lots of pictures. Often times they are funny but disrespectful (captain underpants; super Mario books). How do we transition him to reading chapter books by himself ? (We do a lot of read alouds.) We don’t have video games at home so we thought we’d allow him to read about super Mario but it’s not productive nor does it have good moral values. When doing chores he wants the super Mario soundtrack playing but he gets distracted easily. School work gets hard especially math because he has to work his brains further. And working with me on projects like cleaning out the one cabinet in the garage or fridge is hard for him. He likes using power tools with dad and is able to work with him for a longer time. Following the Thomas Jefferson education, what kind of work is appropriate for 7 year olds? Part of me worry that because I took him out to play a lot when he was 1-5 instead of doing work/small tasks he now finds it hard to do chores and do hard work.  Thoughts and solutions? Thank you so much!