Crunchtastic: Makes up a lot of words, enough to make his own Jan-ish language. Examples of such words are "Ujauja", "Wakiwaki" or, most commonly "Zowazowa" (referring to monsters of the week). Justified that he's a jungle boy.
Dark and Troubled Past: Long decimated his village, turned his father Dan evil, killed his mother. All because they were a PROBLEM in his plans
Housewife: Defied. Ran's wealthy mother would like her to and tries to arrange a marriage for her. To stop this happening, the male Gekirangers all pose as Ran's admirers (to her mother's horror.) Ran eventually makes it clear that she does not want to get married and her role as a Gekiranger is far more important to her.
Punch Catch: How he demonstrates he's not the little kid Gou remembers.
Revenge: His motive for becoming a Gekiranger, as he believed that Rio had killed his brother.
Sibling Yin-Yang: He and Gou are both socially awkward with a tendency to Jerk Ass behaviour, but appear to consider themselves very different in personality and frequently bicker, despite Retsu's anguish for many years over thinking that Gou was dead. Their fighting styles are fairly different, Retsu favoring speed and technique compared to Gou's Bare-Fisted Monk.
Older than They Look: It's sometimes implied that Gou is around the same age as Miki, but stopped aging physically after becoming a werewolf. He also looks the same age in flashbacks to Retsu's childhood.
Former Teen Rebel: She was a sukeban in her youth, and her name still carries enough fear that an entire gang of thugs runs for it when they realize who she is. Thanks to learning Juken, she's actually tougher now than she was back then, she just doesn't show off.
Let's Get Dangerous: She shows off her Leopard-fist skills in the first episode, but then spends most of her time acting as backup. Thirty or so episodes later, Natsume is threatened and Miki displays enough power to impress Mele (who was using Genki at that point). Wow.
Freudian Excuse: Something AKA Long killed his family when he was a child, beginning his obsession with becoming stronger, and Shafu can tell how much it still scares him. May qualify for Jerkass Woobie.
Older than They Look: Going by flashbacks, he's the same age as Gou, but apparently hasn't aged since leaving Gekijyuken.
Pride: A bit more subtle than others, but whenever he gains power, he's quick to assume he's the strongest, and is prefers to work gain rather being handed it, shown when Maku refuses Mele's request to give Rio some his Dorinki, Rio said he would have turned even if Maku did offer it to him.
Berserk Button: Maku is naturally short tempered, but he gets really pissed off by anything he perceives as an insult to his power, which is pressed by anybody but the Kensei challenging him.
Big Bad Wannabe: Maku. He's one of the most feared beings alive for a very good reason, but the real Big Bad is right under his nose, smirking at him. After the Sai Dain's Beast Power Blossom, it's clear he's done.
Stone Wall: Rageku's odd style revolves around causing attacks to pass through her. The other two just No Sell them.
The Dreaded: All three of them. The Kensei really didn't want them back and sealed their souls in bracelets. For Maku, they went the extra mile and removed his heart, which Rio and Mele also had to put back to revive him. Even the other Kenma are terrified of him.
Evil Is Not a Toy: Surprisingly subverted with Kata and Rageku. Rio revives them with the intent of becoming their apprentice, and they do so without any tricks, baring the Training from Hell they put him through, which is what he wanted in the first place. Played straight with Maku, who Rio revives despite being warned that he'll overthrow him. Maku not only does that, but refuses to train Rio.
Master of Illusion: Kata, and oddly, he gets hurt a lot more easily if somebody hits him during them (compare with one punch from Jan pissing him off, to when before the Geki bazooka had no effect on him)
Pride: Maku (see Arrogant Kung-Fu Guy). He was thrilled to be chosen as Brusa E's successor...until he learned that he asked Shafu first, and Shafu declined. Being the second choice ate away at Maku until he went mad.
The Social Darwinist: All three believe that their overwhelming power means they can do whatever they want, but Kata is slightly more eloquent about it. He rants that the weak should obey the strong and the "foolish" listen to the "wise" while fighting the team.
Evil Mentor: Was this Maku in the past. Tries to play it with Rio, but has difficulty with getting him to listen. He states that he was still easier to manipulate than Maku, hence why he keeps using him even after Maku is revived
Expy: His true form looks a lot like King Ghidorah.
For the Evulz: Holy shit yeah! His entire motive is that he thinks the world is boring.
Light Is Not Good: Gold colored outfit, hair, fighting form, true form, and he is easily one of the most evil characters in Super Sentai franchise. Rin Juken is in fact based of his own technique.
Ironic Hell: His motives were escaping boredom, and he ends up sealed into a sphere for all eternity. Lampshaded by Xia Fu.
Smug Snake: His true colors. He smugly mocks everyone and everything in the series. He openly admits that the Rin Juken are nothing of his amusement, mocks the Kensei for believing in fighting to defend others as "rubbish", and chides Juken as nothing more than imitating animals which views himself as the strongest. Unfortunately for everyone else, he can very well back his boasts, and his overconfidence is justified since he can't be killed.