Male OC x Android 21

Vegeta, the Saiyan Prince

Leek: Nappa talked about a legend. Something that happens only once every thousand years... and I think he was right. My name is Leek, a Saiyan raised on Earth... and I am the LEGENDARY SUPER SAIYAN!

Vegeta's eyes widened in fear, but that fear quickly turned to rage.

Vegeta: It can't be... there's no way a low class weakling like you can be the Legendary Super Saiyan!

He rushed at me, throwing a punch, but I easily dodged.  I grabbed his arm and kicked him in the gut, causing him to spit out blood.  I then spun him and threw him into a cliff.  He struggled to get to his feet, and started laughing.

Vegeta: You idiots... you may have destroyed the moon... but we Saiyans have alternatives!

He fired a white energy blast into the air, laughing.  He stared at it, and the ground started shaking as his power skyrocketed.  His body began to grow until he was a giant gorilla.

Vegeta: DIE!

He fired a blast from his mouth, catching me off guard.  It wasn't enough to kill me, but it hurt like hell as I was sent flying away into the distance.  When I finally landed in the ocean, I quickly flew back up into the air, but I noticed Gohan and Krillin flying towards the fight.  I flew after them, appearing next to them.

Leek: Where are you two going?  You don't stand a chance against Vegeta!

Gohan: I have to help dad!

Krillin: Me too.  Goku's my best friend, I'm going to help!

I sighed in frustration and we flew faster, rocketing back towards the fight.  When we got there... Vegeta was holding Goku in both hands, squeezing him.  Krillin threw his Kienzan towards Vegeta's tail, but he just jumped over it as it zipped under him, missing.

Vegeta: Haha!  Is that all you can-

He was cut off as I fired a blast that went through his shoulder, then Yajirobe dove out of the rocks behind him, cutting off Vegeta's tail with his sword.  Vegeta roared in anger and pain as he shrank back down to his base form.  I landed in front of him, pointing my hand at him and powering up a blast, as he tried to crawl back towards his pod.

Leek: Vegeta... this is for all of the innocents you've slaughtered.  Goodb-

Goku: WAIT!

I spun around towards Goku, who was motioning for me to stop.

Goku: Just... let him go.

Leek: WHAT?  After everything he's done?  He killed our friends, Goku.  And tried to do the same to us!

Goku: I know... but... I believe that deep down, he can become a good person.

There was a humming sound behind me as I turned around again.  The pod lifted off the ground, then shot away into the sky.  I sighed in frustration.  I went to help Goku up, but suddenly my body started hurting like hell... and I blacked out.