Arrogant Kung-Fu Guy: The Ape-propriately-named one-episode character Kong Fu. In fact, he's so arrogant that when K. Rool's krew make fun of his phobia, he quits working for them.
Art Devolution: The animation takes a step down in quality in the second season.
Badass Grandpa: It turns out that K. Rool is the same age, or thereabouts, as Cranky Kong.
Retired Badass: K. Rool and Cranky used to do a lot of crazy stunts when they were friends. In the episode about their former relationship, they mention "tsunami wrestling" and "skydiving without a parachute".
Be Careful What You Wish For: The Crystal Coconut can grant wishes, so this trope comes up now and again. The biggest example would be in 'The Day The Island Stood Still'; DK, about to take a nap, absent-mindedly wishes he could sleep forever. The result is time halting...and he can't protect the island if he's napping...
Benevolent Boss: While King K. Rool might sound like a Bad Boss, he does take pretty good care of his troops, despite their fumblings.
Beta Couple: Diddy and Dixie to Donkey and Candy's Alpha Couple, though Diddy sometimes reciprocates the feelings when it's not directly or heavily implied.
Big "NO!": K. Rool's reaction to when Klump's video conference messes up his game playing in "Buried Treasure".
Broken Aesop: Subverted. In the episode "Bug A Boogie", Cranky tries to show DK and Diddy that practical jokes aren't fun... by pulling a practical joke on them. However, this actually comes back to bite him when not having DK around due to said practical joke leaves the Crystal Coconut unprotected, fixing the Aesop.
Butt Monkey: DK himself is this, in "Kong for a Day" and the majority of season two.
Cranky also qualifies, as he's been injured at least once by every other character in the show, most often by Donkey Kong.
Canon Foreigner: Bluster, Inka Dinka Doo, Polly Roger, Eddie the Mean Old Yeti and Skurvy and his crew.
Krusha: The apes will have complete control over Kongobongo, and probably turn us into matching luggage.
K. Rool: ...he does have his moments...
And again in, "Monkey Seer, Monkey Do", after they steal the mystic oracle (Funky's lava lamp). The crocs spend several elaborate dances trying to "summon the oracle", only for Krusha to point out that the lamp isn't even on.
Dumb Muscle: King K. Rool and his henchmen (especially Krusha), Eddie the Mean Old Yeti, and to a lesser extent, Donkey Kong.
Do Not Adjust Your Set: In the B-plot of Bluster's Sales Ape-Straveganza, K. Rool decides to steal the Crystal Coconut on live TV.
Guns Are Worthless: A notable aversion, as anyone with any sort of firearm, no matter how ridiculous the weapon (or how ridiculous the wielder, in the case of Bluster's Let's Get Dangerous) is taken quite seriously.
Hard Work Hardly Works: Averted. While DK is 'The biggest, strongest ape on all of Kongo Bongo' the episode 'Kong Fu' shows that if he just sits around eating bananas, he loses that strength.
Have a Gay Old Time: Modern audiences snicker at Diddy telling Donkey that "Your plan's a bit of a boner" in one episode.
Hero with an F in Good: Bluster Kong. His attempts to legitimately help his fellow apes in 'Get a Life, Don't Save One!' and 'Bluster the Benevolent' are so destructive (not to mention annoying and overblown) that We Want Our Jerk Back ensues.
I'm Not a Doctor, but I Play One on TV: DK's not a villain. But he played one in Bluster's movie and when K. Rool, playing the hero, stole the Crystal Coconut DK got the blame and was banished for it.
Ineffectual Sympathetic Villain: K. Rool has to deal with stupidity from his minions, repeated failures, and repeated beatings from Donkey Kong, but his Large HamLaughably Evil tendencies make him one of the highlights of the show, and you really do feel sorry for him with what he has to put up with. In one episode he spends most of it watching Krusha and Klump try to troubleshoot their way into decoding a message they themselves wrote and forgot the code to, and K. Rool mutters to himself, "It's times like this I find myself asking: do I really want the Crystal Coconut this badly?"
Insistent Terminology: Or rather, insistence on not using a particular terminology. The word "Kremling" is never heard at any point throughout the series. Instead, the minions are called "Kritters".
Fridge Brilliance: Probably because that's what they are; like all of the Kremlings in the show, they're based on a specific enemy from the first Donkey Kong Country game — specifically, the basically "Kremling grunt" or "Kritter". Kremling means the race as a whole, but K. Rool's minions are all Kritter-type Kremlings.
Donkey Kong is never referred to as just "Donkey", even though every other Kong shares his surname. It's always "Donkey Kong" or "DK". Dixie once refers to "Donkey and Diddy", but that's it in two seasons.
Nice Job Breaking It, Hero: The conflict in 'Legend of the Crystal Coconut' began when DK just GAVE the MacGuffin to K.Rool under the belief that would grant him enlightenment. (To know everything you must give up everything)
Out of Focus: Dixie gets this treatment pretty badly, having like one single episode or two dedicated for her. Even in Message in a Bottle Show, she's the only one out of everybody and the villains who hardly does anything with DK and thus doesn't even get to use flashbacks. It feels like she's a Recurring Extra rather than a secondary character.
To a lesser extent, Scurvy and his crew. The family root reveal kind of put an end to his shenanigans.
Pirate Booty: One episode revolves around most of the main characters looking for Buried Treasure pinpointed on a map that DK finds. The Kongs believe the treasure is money, and King K. Rool believes it is a Doomsday Device. It turns out to be some now-spoiled bananas that DK buried in his youth.
The Easy Amnesia episode brings Skurvy and his crew into the fold by trying to dig up treasure they buried on the beach. "Captain, why does we bury the treasure?"
Sadistic Choice: In the episode "Speed", Krusha, his intelligence increased, traps Diddy and Dixie on a runaway mine cart with no breaks and a bomb that will explode if it does stop. DK has to choice between staying and defending the Crystal Coconut, or going off to save his friends. Naturally, DK goes off...but not before taking the Coconut with him!
Scooby-Dooby Doors: Donkey and Diddy briefly chase Polly Roger into this trope in "Raiders of the Lost Banana".
Snipe Hunt: Bug a Boogie features MULTIPLE snipe hunts, starting when DK and Diddy trick K. Rool's crew into thinking there's a magic amulet in the swamp, Cranky tricks the two apes that some trinket is cursed, and then K. Rool tricking Scurvy into coming after an amulet.
Spy Speak: Klump does this. K. Rool is not impressed.
Too Dumb to Live: Klump and Krusha, especially in Speak No Evil, Dude, where they misinterpret K. Rool's sickened grunts into blowing up the island...with everyone and THEM on it. To further prove the point, Cranky tried to point it out, yet Klump thought it was a mental trick.
The Unseen: Dixie's pet crab. The episodes make everything in their power to make the pet not get seen in the picture. Only the characters can see where it is, usually about to cause some sort of accident.
Unspoken Plan Guarantee: In 'Watch The Skies', K. Rool decides that "Secrecy is the key" and makes sure almost no one in his forces know what episode's 'Project X' is. According to Klump, each Kritter builds a piece of the weapon in their spare time, and the general assembles the thing in complete darkness, with his eyes closed.
K. Rool and Cranky's case is interesting. They both become friends, ending the Kong and croc feud, but their pranks tick off everyone so much that DK, Diddy, Klump and Krusha conspire to make them enemies again.