His successor, Korra, is even more of one, which shouldn't be surprising given that she's the result of the world's most intrinsically-talented bender being raised from childhood in multiple forms of martial arts. Even without the Avatar State, she's able to overpower just about everyone, and one she starts learning airbending, she becomes just as adept at evasion as she is at tanking hits.
The same could be said for many of the villains. Amon is an extremely agile and nimble fighter with the strength to take down even the most skilled benders with no sweat, Vaatu's massive size and damaging power definitely doesn't reflect his speed, just like other spirits and Unalaq moves extremely fast & hits very hard.
Rainbow Dash is a boisterous tomboy and has been shown to not only fly fast enough to accomplish the legendary "Sonic Rainboom" — the only pegasus known to have ever done so, including the two god-princessalicorns — but has since also gained enough control over the ability to use it to create a large ground explosion in order to demolish a barn. And that's just the tip of the iceberg; Aside from breaking the sound barrier, Dash can also stand her own in a fight and on one occasion, kicked a fully grown dragon in the face hard enough to not only provoke it into going on the offensive, when the entire problem the dragon posed was that it refused to get up from its nap, but actually whine near-tearfully about it afterwards in conjunction with Fluttershy's amazing verbal beatdown. Flying at supersonic speeds, able to create an explosion powerful enough to crack rock miles away, enduring hits that would reduce anyone else to pulp with nothing but Amusing Injuries... Rainbow Dash is definitely an exaggerated example.
Applejack is physically the strongest of the Mane Six, able to easily buck apples off of trees or hit a high striker so hard its bell flies off, and she also has a very fast running speed. Rainbow Dash even admitted during her "Hot Minute" clip that she and Applejack raced each other completely fairly, meaning with Rainbow Dash not using her wings to cheat like she did in "Fall Weather Friends," Applejack might have beaten her.
In the season 4 finale, Twilight Sparkle becomes this trope. With the combined magic of the three most powerful alicorns in Equestria, in addition to her own, Twilight goes toe to toe with Lord Tirek, who has the power of literally everyone else in the country... and she gains the upper hand, simultaneously overpowering them *and* moving with great speed, when not simply teleporting at a moment's notice. There's some signs that she can do this even without All Your Powers Combined, but doesn't usually press herself in this way.
The Scotsman from Samurai Jack is about three times Jack's size, tough as nails, and easily capable of matching Jack's speed and strength. He also has a Scottish Claymore inscribed with ancient Celtic runes that made it nearly indestructible and increased its destructive power, allowing it to match even Jack's blade. It's because of the traits that Jack wound up fighting the Scotsman to a standstill for three days and nights.
Don't forget the Minions of Set. Despite having hugely overbuilt upper bodies, very short, slender legs and enough weight to make the ground rumble beneath their feet, they are extremely fast and agile. Jack is so overwhelmed by the way they constantly jump around in combat that he can hardly tell which direction their attacks are coming from.
Season 5 introduced the Daughters of Aku. They've been put through Training from Hell to go up against the likes of Jack. Their ambush on the samurai gave him a run for his money as they literally ran circles around him (via dodging bullets from his machine gun) whilst barraging through his armor piece by piece, and decked him so hard he got sent flying. Although as dangerous as they were as a group, they were only able to stand against Jack with surprise on their side, and ultimately all but one is easily incapacitated and later killed by Jack because he's more of an experienced and tactical combatant. The one daughter that survives, Ashi, stands out from her sisters the most, as best shown in Episode XCVIII, where she totally decimates an entire army of Orcs that came to kill Jack (she even grabs the first one while mashing through multiple ones down a cliffside) as well as defeating her own mother who was probably her most challenging fight besides Jack.
Zeb from Star Wars Rebels is the physically strongest member of the team, and is also very fast and acrobatic.
Steven Universe features Garnet, who's both superhumanly agile and a top-class bruiser. Her footwork and movement speeds are comparable to Pearl and Amethyst, and she's also the offensive heavyweight of the Crystal Gems. This makes sense as she's a fusion of Ruby and Sapphire.
Yellow Diamond is an absolutely gigantic gem, who not only covers a lot of ground with each stride, but has a similar dash-ability to Garnet. She's also got immense strength, and has a ranged attack that destabilizes gems. When she finally enters battle, she and Blue Diamond wipethe floor with the Crystal Gems.
In the 2003 Teenage Mutant Ninja Turtles series, Hun is a humongous mountain of a man, and one of the largest human characters in the series—the official stats put him at 7'2 and 500 pounds. His speed and agility, however, is consistently shown to be on par with all the other martial artists.
Optimus Prime in Transformers: Generation 1, if the tech specs are anything to go by. Compared to the rest of the Ark crew, he matches or outpaces other characters who are considered specialists - among other things, he's stronger and tougher than Brawn, just behind Bluestreak in firepower, and every bit as fast as Windcharger. When you're a truck and the only character who can outrun you is a jet fighter, you know you're lightning-fast.