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

Nappa, the weakling

With Yamcha dead, my anger spikes, my full base power flaring. The scouters explode, the last reading present 30,000. Nappa becomes annoyed, thinking the Scouter was bugging...but it wasn't. Vegeta instantly looks to Nappa, realising how bad this is. "Nappa, make an artifical moon! The scouters aren't bugged! These are the new models in testing!" Vegeta calls out, already alert. Nappa looks at Vegeta with confidence, but when he sees his expression of fear...he realises Vegeta is right. He creates an Artificial Moon, throwing it into the sky.
"BURST OPEN AND MIX!" Nappa roars, closing his hand into a fist. The light shines down on the battlefield as Nappa starts to grow in size. Vegeta doesn't look at it, simply watching. He avoids looking at the moon, wanting Nappa to handle this. I calm myself down, breathing in and out. I wait for Nappa to finish transforming, noticing Piccolo is covering Gohan's eyes. I don't really react, focused on the fact that Yamcha died. I wait. Nappa grows in size, fur covering his body as he becomes massive, rising up as a Great Ape.
"40,000 at maximum, somewhere around 35k to 39k due to the artificial moon. A power jump I can easily handle. This one is for Yamcha, you bastard." I warn, threatening Nappa with death with my tone. "Kaioken times 2." A red aura erupts out, my power doubling with the Kaioken. Nappa doesn't stand a chance. I don't show mercy, completely humiliating Nappa. He can't touch me at all due to greater speed and power. Flying around him with times three, I use a ki blade to cut off his tail, forcibly reverting him back to his normal self. I then blast the artifical moon, destroying it. "No more Great Ape form for you." I think my gaze to Vegeta. "As for you, we fight elsewhere. The Gizard Wasteland that way. No life is there." I point in the direction or the wasteland, then looking at Nappa and finishing him off with a blast, leaving nothing behind. Vegeta seems concerned, but tries to mask it with confidence.
"A Saiyan could never lose to an earthling. I'll play your game then, we'll fight there. You can choose where you get to die, after all." Vegeta replies, showing a mask of confidence, while internally being worried. I fly off to the wasteland, making sure Vegeta is following. I'm not happy at all right now, but I need to keep it under control. Something stirs, however. Something evil within me. A very familiar power. One that leads me to have a clouded judgement. Vegeta won't die here, but he will be beaten badly. Toyed with. Broken. Internally, my mind is cloaked in the villainous power that Towa grants to her allies. This dormant power. It's corrupting, but I can control it. I'm not a pawn.