I believe the touch up to Kame Senin being the one mentioned for frightening Daimao was added so I'll jump to that other point.
Toriyama I believe has commonly followed the don't judge a book by it's cover motif. Something that fascinates me about his characters is when he commonly makes the small or meeker looking characters be the true forces to be reckoned with. In Goku's case he was a kid who defined this trope. Constantly adult figures or large anthropomorphic beasts (especially most Red Ribbon Army soldiers and associates) would look at him as a child, and then Goku would proceed to leave them dumbfounded by his might, or they'd be KOed. Several encounters in Dragon Ball always start with Goku being pointed out for being a child, Goku being laughed at or underestimated, and then Goku getting comeuppance in his usual no ill will way. It's also pretty cool how Goku doesn't stereo typically whine about people trying to treat him like a kid, but instead just prefers to let his actions and capabilities speak for him. Goku is the first person I saw break the mold of children being weak cry babies who are overall useless compared to the manly big muscled strong guys. Goku is predated even by Arale, a little robot girl who boasts far more incredible ability than her appearance shows.
Toriyama doesn't just limit this philosophy to kids. For example we have Vegeta and Nappa. Nappa is this big strong meat head, while Vegeta is this cold calculating shrimp. Vegeta while not even comparing to Nappa's build, is actually far stronger and more capable than he is. So much so he frightens the much larger behemoth. Toriyama even guys who ought to be strong are actually weak in his works. Piccolo mentions the don't judge a book by it's cover message after Freeza reveals his final form. Freeza kept getting bigger and uglier, and then suddenly he shrinks down into a slim, small, sleek look. Even though Freeza looked less frightening, he became far more terrifying than ever before. Beerus is a skinny meek looking cat, with even his rib cage showing. The poor guy looks like he hardly ever eats. Yet this feline is not only far more powerful than he looks, but he's the God of Destruction. It's kinda sad that once I step out of Toriyama's magical world, things turn back to normal. Small and frail looking characters are usually weak and/or super smart (commonly children) to compensate. On the opposite side big strong musclebound characters are big guys who are morons to the point they sometimes even purposely slow. Such a concept doesn't seem like such a big deal, but surprisingly I'm really bothered when physical stereotypes are point for point. Now if only more women in Dragon Ball could be as incredible as the males. Come on Mr. Toriyama, I'm sure you can make females awesome too. 18 was a really good start.
http://www.kanzenshuu.com/translations/ ... interview/
A quote for this point is here, it's about Beerus but also holds the statement I was talking about.
? Edit: What happened to Brigitte Lecordier 
? Wasn't she in touch with the DB multiverse guys and therefore with me? Dang.