I always love books were the mc can drain life force or something similar from his enemies. I hope you don't drop this story because that would be disappointing.
I usually don't read fanfictions were the mc replaces the original mc but I think you did it well and the story is also developing well. I wonder I you plan on having the mc be with chichi just so that Gohan is born or will the mc actually love her.
I always love this types of stories where the main character can copy other people's abilities and skills. It's also nice to se the main character travel to different worlds. I really hope that the author doesn't drop the story.
take your time. It's not good to overwork yourself. You can write when you have the time so that you dont loss intres in writing this story by rushing it too much.