And that reason is that the fans don't care about the fact that the Kaioken is not an easy technique, that it's so difficult that combat genius Goku took months to learn it to an acceptable degree and that the only guy who can teach you is in the afterlife.
himitsu keisatsu seifu chokuzoku kokka hoanbu na no da himitsu keisatsu yami ni magireru supai katsudou torishimariI always assumed it would just make the humans' bodies go squish if they even attempted it. Goku's body has always been naturally tougher than everyone else's.
As for Piccolo, maybe he just doesn't like the loss of stamina and hurting his body for a brief boost in strength.
himitsu keisatsu seifu chokuzoku kokka hoanbu na no da himitsu keisatsu yami ni magireru supai katsudou torishimariThat is afair point. I guess the main reason fans wanted to other characters to learn Kaio Ken is that they want some way to catch up to Goku and to defeat a villain for once.
"Mai waifu."Ignoring base power, even though we shouldn't, the very least they'd need is Kaioken x400 in order to catch up to SSJ 3 Goku, and it only goes further up with the god forms.
And that's, again, ignoring the fact that the highest ever recorded powerlevel for a human was Krillin's 75.000, which pales in comparison to Goku's 3.000.000 at around the same time.
himitsu keisatsu seifu chokuzoku kokka hoanbu na no da himitsu keisatsu yami ni magireru supai katsudou torishimariThey should go Kay-o-ken times 100...
Rules of the Internet 45. Rule 45 is a lie. Check out my art if you notice.Only Cell and Super Buu would have a reason to know Kaioken (Cell from Goku's Cells, Super Buu from Krillin or Piccolo if they learned it). That's not too big of a deal in grand scheme of things, especially with Super around to give us literally one other character that could know it (and only in the anime). Teaching the humans, Fat Buu, and Piccolo Kaioken probably won't be the deal breaker Saiga predicts it would.
I don't want to sound rude but it's really obvious that's the only reason this suggestion comes up. A pointless idea that never would have helped mind you.
edited 6th Jan '17 6:48:32 AM by VeryMelon
Here's the quote from Piccolo:
Piccolo: “Commit this to memory: when we fight, we amplify what you guys call ‘energy’, causing it to explode. That’s why the energy you stole from me earlier doesn’t matter…”
However, Piccolo's comment sounds more fitting for general suppression/powering up. Like Vegeta said about Goku:
Jheese: “Wh-what’s going on…?! There’s no mistake that his battle power is only 5,000…”
Vegeta: “Ka-Kakarot rapidly heightens his battle power for the brief instant when he attacks…That’s probably to decrease unnecessary energy consumption…It’s for an extremely brief instant, so even the scouters probably can’t pick up on it…Th-this is an outrageous battle power…H-how did he get that kind of power?...”
They clearly don't have any physical indicators of Kaio-ken. Thanks to the anime, some people believed that Goku achieved an "invisible Kaio-ken" and that Piccolo's comments mean the rest of them did as well. But there's no such thing in the manga, and they're already manipulating their battle power without Kaio-ken.
That's not the point. What I have been saying, is that any enemy fought without Kaio-ken is an enemy that could have just outright won if they did have Kaio-ken, which they totally could have if it's opened up to everyone. So either every villain has Kaio-ken to be at their full potential power, or we know in advance that the villain is not as strong as they could be just with in-universe information.
It's easy to say why certain characters wouldn't have it in-universe, but it doesn't represent the problem that everyone SHOULD have it or they're effectively handicapped.
edited 6th Jan '17 6:53:51 AM by Saiga
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To be fair, it likely would have happened even if I had said nothing at all. At least I get a badass line before I go.
And they always have been really.
Look at the Piccolo Daimou saga:
1) Krillin killed off right at the start with little effort;
2) Yamcha doesn't even get to the fight in time due to his injury taking too long to heal, and then arriving after it's already happened (and he was already drifting into uselessness post Pilaf arc though his Memetic Loser status wasn't cemented quite yet);
3) Tenshihan, who had fought Goku near equally one arc earlier, was left to only watch as Goku and Piccolo threw down, having been rendered utterly irrelevant outside of briefly saving Goku with his levitation technique.
4) Roshi came to closest to doing anything, but botched it at the last moment;
Entire armies utterly useless against Piccolo's pure power, letting him conquer the entire world with little to no effort.
Yeah. Humans suck. We've all known it. I don't like that Toriyama went in that direction, but we are where we are.
One Strip! One Strip!

I mean, unless the villain is stronger than the Kaio-ken like Frieza was; there's really no reason why the villains would need to know it at all, especially since people were just fine with only Goku having it against Vegeta and the Ginyu Force.
Let's see if you can get past my Beelzemon. Mephiles, WARP SHINKA!