This has been done many times before. A what if YouTuber or a Fanfiction Writer putting themselves or their OC's into Dragon Ball or another anime. Well now I'm gonna do it. Yes I know I have many other stories I could be doing instead of my personal love letter to dragon ball but hey I just thought why not.
Name: Son Gyūmaō
(I would have named him Gohan Jr. but out of simplicity sake I made him Gohan's Twin Brother. Yes I know I already done one on Gohan's twin brother. And if you don’t know what Gyūmaō means I'll tell you it means Ox-King in Japanese. Yes he is named after the Ox-king.)
Nickname: Jr.
(He has the Nickname Jr because he takes more after Goku.)
Age: 5
(He is five years old at the beginning of Z.)
Gender: Male
Romantic Orientation: Heterosexual/Straight
Species: Human 50%, Saiyan 50%
Blood Type: B-
General Appearance: He looks similar to Gohan but he has short hair and has more muscle tone due to training
Handedness: Right
Personality: He is much more inclined to train and fight than he bother Gohan. He is curious like a normal person his age would be. He isn't shy like his brother Gohan and has quite a mouth on him that can sometimes get. Him into trouble.
Powers and Abilities:
He doesn't have any powers exactly. Though he does have the normal traits of a saiyan like a tail and the love for fighting. Goku has trained him but he hasn't learned the Kamehameha because Chichi insisted that he is too young. Beyond that he is much stronger than a normal kid his age.
Power Level: 120
(I think this is reasonable. Goku's power level went up a little bit to because he had a training partner.)
Goku's Power Level: 500
(He was originally at 410 so he went up a little bit.)
After some thought I realized that Gohan would be a bit stronger to because Gyūmaō would have gotten him to train too.
Gohan Power Level: 40