The time I was fused with my cat and sent into the Dragon Ball world

Frieza, Villainous powered

Nail stumbles backwards, regenerating from losing his arm after nearly dying against Frieza for several minutes as the skies turn dark. He notices, and so does Frieza, but Nail doesn't let him escape, firing a huge blast at him at the same time as another blast fires from above. My blast. The blast hits Frieza, cracking one of his horns, but not much damage is done. I descend, powering up with the Ultra Superhero power, as I'll call it for now, but I know that's a trash name, and it needs work. Something like Ultra Pure Power would work more, but whatever. Flying in, I don't waste time and attack Frieza, joining Nail in the battle. Nail looks at me, regenerating to cover as he does so. "I don't know who you are, but your work in defending Namek is welcome. This bastard is far too strong for me alone. You seem to be using something similar to his power but purified. I thank you for your aid." Nail says, hopeful, but equally desperate to see Frieza dead.
"It doesn't matter how many of you there are, I will get my wish! Now, tell me how to use the Dragon Balls!" Freiza demands, threatening me and Nail for answers. I let out a chuckle, smirking.
"You're a fool. You don't know Namekian, and the wishes have already been made! You won't win here, Frieza. Not with what I've got coming." I respond, confident and knowing what's coming from Toronbo to me. A golden light comes from above, striking me as the wish is granted. My power surges, my ki washing over everything on Namek. "My wish has been granted! This is it for you, Frieza! No matter how strong you get, you won't stop your death!"
"What is the meaning of this?! There are other sets?!" Freiza questions, shocked and horrified at how much my power is growing. The fused body getting a potential unlock means Zoom is also getting that potential unlock alongside me, so our power is growing much more than it would separate. As the power is unleashed, a golden light erupts from the other side of the planet in a pillar of energy and thunder strikes. I sensed an energy similar to Frieza before, but only now do I know what happened. Cooler. Fu is messing with events as we speak. This knowledge drives me into a blood boiling rage, and fur starts to grow over my body. My hair grows out into a Super Saiyan 4 style. My eyes dilate. At the same time, Goku AND Gohan awaken to the Legend. The Super Saiyan. Two primal roars echo from Goku and Gohan's side of the planet, as from me a cry of pure rage and a wild hissing rises forth. The transformations complete all at the same time, the planet shaking from our power. I sense something else that makes me even more angry next, and I remember something. Guru dies on Namek due to Frieza invading, and it strains him too much. Guru died early.
"For all those you killed, for all those who suffered because of you, I will KILL YOU, FRIEZA!" I roar in rage, all my hate on display. My righteous fury. Everything comes out at once, as I feel eyes from my old world watching from somewhere. Ancestors long dead, watching from somewhere. "Nail, get out of here while you can. I'll put an end to this monster myself. Go while I have control over myself." Nail hesitates for a moment, but the sight of Frieza powering up, and my own rage makes him quickly comply as he flies away with what remaining power he has. I turn my eyes to face Frieza, letting everything show. As his Final Form is revealed, I watch the purple aura around him change into the Super Villainous aura. He's evolved, but what I am now will surpass all he is, I won't lose here. Death won't take me yet, but if I have to kill Frieza myself, so be it.