Animal Motif: The serpent, of course. If you look carefully, you can see the eight heads hidden all over his armor.
Awesome, but Impractical: Almost all of his moves are non-elemental, deals small damage, has awkward coverage, and is unsafe in general. The only thing that saves makes him the Purposefully Overpowered character that he is intended to be are his C1-1.
Bad Boss: In the second game, he executed Diamondback for being a coward. Later in the third game, however, Diamondback is inexplicably returned, alive and well. It's implied that Hydra's power is the one who cause the constant revival of Demon Army generals, proven by Kiyomori's constant revival in one of the stage confronting Hydra.
Enemy Mine: In the third game, she works with the Resistance to take down the Hydra, which she doesn't acknowledge as the true Orochi. Of course, she's just using this opportunity to try and revive the real Orochi.
The Hedonist/The Sociopath: All she wants is to have fun, and her idea of fun consists mainly of hearing people scream and seeing them suffer. Historically, she is the one who invented the idea of a "Paradise on Earth (酒池肉林)" that Dong Zhuo constantly pursued, which oddly enough didn't get any reference in-game.
Villains Never Lie: Da Ji never outright lies - she omits important parts of the truth a lot, and can be misleading, but she never says anything that's blatantly false. This may have something to do with how foxes in both Chinese and Japanese myths are unable to lie. That makes her skills as military strategist all the more impressive. Taigong Wang even states that she can't be trusted because she's not being ENTIRELY truthful, but at no point does he claim she's lying, just that she's keeping her own motives largely to herself.
Carry a Big Stick: Wields a fishing rod as Weapon of Choice. Although this is justified, as it is a reference to the myth about him fish with a fishing rod with a needle for the hook. Furthermore, the name for one of his weapon variant hints that it's the Divine Whip he wields in folk legends.
Medium Awareness: Played with. Near the conclusion of both 2 and 3, he would comments something along the line of "this story is closing to an end". Whether he's just speaking metaphorically, or otherwise, is up to the player's interpretation.
Smug Super: Frequently boasts about his great and magnificent self, and his quote upon defeating an officer is "Victory, as usual." Although the facts probably aren't too far-stretched, either, since he is a Mystic after all.
Action Girl: In the third game, She is the only female character out of 132 playable characters in the entire game that's Power-category, which is normally reserved to exceptionally strong or Hot-Blooded characters.
Heel-Face Revolving Door: Strangely enough, there's one stage where he is part of Mystics Army. But it's pretty obvious he only was there to convince Nezha to join Kiyomori, who is indeed recharge the cyborg with new magical power in later battle. However, it's still pretty strange that Susano'o was there but wasn't even paying attention that Wukong was in his army.
Fragile Speedster: Moves really fast (justified, as he is riding a cloud after all), but can't take much hits. The third game nerfed his speed down a lot, but in turn made him sturdier, and he gained the ability to Flash Step for being a Wonder type character.
Punch Clock Villain: Works for Orochi, but only because he was summoned by Kiyomori. He doesn't take battles too personally and is mostly only interested in getting into a good fight than actually committing evil.
Dance Battler: Commands her dogu drones with J-Pop idol-inspired dance moves.
Glass Cannon: Has both incredible attack range and power, but is fairly fragile. When you face her during story mode, whoever attacks first wins. Woe to you if she manages to hit you with her Musou attack, 'cause you just lost the battle, hard.
Demonic mooks serving Orochi, they were made playable characters in later games. Although they already appeared since Warriors Orochi 2 as Orochi's generics, they only debuted as playable since Musou Orochi Z.
The Atoner: In the third game, their dialogue in the camp upon unlocking them indicates that they were press-ganged into serving the Resistance to atone for their crimes. Surprisingly, they seem to be mostly content with this.
The Brute: Gyuki, who's also the largest playable character ever shown.
Elite Mooks: Probably the main reason why out of all the characters in the game, they're the only ones without special conversations with another character. (Aside from Hundun)
Dodomeki also lampshades this by musing that he probably "doesn't stand out from the crowd" when you don't use him in your team for several battles.
Full Boar Action: Despite his name, Gyuki looks like a giant boar demon (Gyuki means demon bull).
Giant Mook: Gyuki is much larger than most other characters. Despite this, it doesn't make him immune to grab attacks, meaning that Ryu can still pull off the Izuna Drop on him or that Lu Bu can still chokeslam him.
This is zigzagged somewhat confusingly based on his other lines: when he's invited to a party in the third game, he understandably says "no pork for me" but his Mirror Match line is "that looks delicious".
Mighty Glacier: Gyuki's attacks are unbelievably slow but hit extremely hard.
Obake: In japanese folklore, Dodomeki is a female wraith with eyes over her arms, while Gyuki (or Ushi Oni) is a demonic beast whose descriprion depends on the source. Furthermore the various Dodomeki mooks in the Japanese version have youkai's names.
Token Good Teammate: In the Dream Battles featuring him, his original plan was to find his lord, Yoshitsune, but since he stumbled upon Da Ji and Himiko first, completely oblivious of who they actually are, he is forced to fight against him.
Warrior Monk: He is this, historically, although it's not referenced very often in the game. However, it is lampshaded in DLC Stage "Warriors of Purity".
Heel-Face Revolving Door: In a sense. Once he ran out of power and Susano'o didn't even bother to recharge him, Wukong, as an old friend, brought him to Kiyomori to be recharged with his magic, and Nezha now sides with Kiyomori, spotted with Wukong nearly every time. He only did this when fighting against humanity, though, and never actually betray his fellow Mystics. And later in the last conflict between Mystics and humanity, he sides with Mystics again to fight against human's forces again.
Member of the Dragon Clan and The Hero of the Ninja Gaiden series. Whisked away to the WO universe while pursuing a demon before the events of Ninja Gaiden 3 and being the evil-hunting Badass ninja he is, set his sights to stop Kiyomori.
Joan of Arc is The Maid of Orleans and French heroine. While tending to wounded French soldiers, some of them were whisked away into the WO universe and Joan tried saving them, only to stumble there and eventually helps out the Resistance.
Greek Hero of the Trojan war, an invincible warrior whose only weakness is his heel. Stumbling upon the WO universe on his own, he fights for his own glory and sided with Orochi in the same vein of Lu Bu, trying to find worthy fights.
Achilles' Heel: Despite being the Trope Namer, this is averted in this game. You can't hit his heel, but he goes down just fine if you pound him enough in any body part.
Luckily My Shield Will Protect Me: One of the few characters to use a shield. He can block with it and has an attack in which he flips an enemy onto the ground with it and stabs them in the mid-quarters.
Sprite/Polygon Mix: Being from a 2D game, his art style is conspicuously different from the rest of the cast. The differences become especially jarring when he has camp conversations with another 3D-rendered character.
Elite Mooks: Subverted. He is, by any means, never become playable, nor does he stronger than other serpent generics storywise. However, he is the commander for Orochi Army in several stages, therefore has enhancement aura activated at those occassions, which do actually make him stronger than his fellow generics.
The Generic Guy: His main purpose is to either defend a specific position or to serve as a commander when other unique characters aren't present.
Small Name, Big Ego: So much so that some fans even consider him as Yuan Shu's version of Warriors Orochi series, for their big and misplaced ego. Heck, in DLC stage "Keiji's Theme", he self-proclaims this epic asskicking music to be his own theme song! Keiji Maeda is obviously less than impressed.
The Starscream: In a DLC stage "Every Snake Has Its Days", he declares independence and lead all other serpent generics (except Dodomeki, Gyuki, and their respective clones) to betray Demon Army led by Kiyomori. He also enlists the aid from Nobunaga, Zuo Ci, and several other humans to be his allies. But, unexpectedly for him, after managed to defeat Kiyomori, the evil sorcerer summons Orochi X, which cause Diamondback to be...
Dirty Coward: He runs without any resistance upon seeing Orochi X, and leave the rest of everything to his human allies. But considering Orochi X became a Bad Boss by executing him in the second game, we can't completely blame him.
Theme Naming: His Japanese name, Mizuchi, is derived from a Japanese dragon or serpent-like creature. His English name, Diamondback, on the other hand, is derived from a snake species.
Unexplained Recovery: He got decapitated by Orochi X for fearing the enemy, twice (albeit in different storylines), yet comes the third game and he's very much alive and kicking, acting as the commander for the Demon Army in many battles.
It's implied that Hydra's power is the one who cause the constant revival of Demon Army generals, proven by Kiyomori's constant revival in one of the stage confronting Hydra.