Authority Equals Asskicking: Downplayed. He is revealed to be the one true Noblesse, who is the most powerful Noble in existence and the avatar of Strength but explicitly does not hold any authority. The lord is the avatar of Authority..
Battle Aura: It is later revealed his Blood Field is actually this; its function is to suppress those who has blood.
Berserk Button: Do not harm the innocent, the weak, and anyone he considers family within his earshot. He'll be more than willing to throw himself into danger to personally execute those guilty of such.
Comes Great Responsibility: As his title may have implied, he operates firmy under the noblesse oblige principle: Those with power must protect the weak. Some of the traitor clan leaders defected precisely because they didn't agree with this view.
Curb-Stomp Battle: The only reason why a battle that involves him takes longer than it should is normally because he's using it as an opportunity to make it a tutorial for his underlings on how to utilize their power.
The Dreaded: As the Noblesse, he is feared by even the clan leaders, not only because he is very powerful, but also because he has the authority to execute them if he finds them guilty. He is so feared that when news break that he is still alive, the Union flies into panic.
Hikikomori: In the past. He only left his mansion when summoned by the Lord, which happened very infrequently.
King Incognito: Pretty much the definition of Rai. His title, the Noblesse, signifies him as the Noble race's avatar of Strength, but it requires him to work in secret; none of the newly-promoted clan leaders even know who he is. He's sort of like a secret Assassin King that erases all of the Noble race's problems. Even more, in the past he regularly mind-wiped clan leaders who paid him a visit for chit-chat. It can get pretty humorous when every single villain chooses to ignore or overlook him in favor of weaker characters. And the ones who eventually realize how powerful he is tend not to live very long.
Kuudere: Appears cold from everyone's perspective but at some times he does show concern and care towards people that he had associated with.
Limited Wardrobe: His wardrobe consists of only school uniforms, and he still takes ages to choose what he wants to wear!
Signature Move: Rai keeps to a strict schedule of sitting around and drinking tea for 95% of his day. He is never seen without his tea cup in his hand, quietly listening to everything that is happening... until he has something to say. Then there is the signature *click* of his tea cup hitting the saucer, and Words of Wisdom from The Ages flow forth from his mouth. He also likes to look out of a window, a habit he's had for as long as he has lived.
A Spot Of Tea: Seen drinking tea whenever he's not busy fighting (...or eating ramen).
Summon Magic: When in his winged mode, he can call a blood eagle to finish off his target.
Why Did It Have To Be Doors?: For the longest time, Rai had trouble with opening Frankenstein's apartment door. (In fact, during the big battle of a story arc, it repeatedly cut to him trying to open the door with no success and ended with him breaking Frankenstein's window. He still didn't manage to get out.) He has since conquered this in a Crowning Moment of Awesome. Unfortunately, he now has to confront automatic doors...
Evil Weapon: Apparently a counterpart to soul weapons, Frank can summon the Dark Spear, which provides a similar measure of power to a soul weapon — but has a noticeably darker aura...and tries to eat him alive.
Fangs Are Evil: When Rai gave him permission to release his seal when he encountered the Kertia noble.
Humans Are Special: Revealed in chapter 190. He was explicitly acknowledged by the previous Lord because he had power rivalling that of a clan leader's DESPITE being human. This kind of potential is implied to be something that Nobles lack.
Subordinate Excuse: Frankenstain is a wealthy high school principal, whom after 800 years of being his own man, immediately reappoints himself as butler, caretaker & bodyguard of the Noblesse, whom he was looking for the entire time.
Time to Unlock More True Potential: Actually a logical version of this trope. As M-21's body attunes itself more and more to the werewolf heart implanted in him, he gains access to more and more of a true werewolf's strength.
Charles Atlas Superpower: Deconstructed; while Shinwoo has expansive knowledge and experience in martial arts, because he spends so much time practising he is unable to catch up to the class. Also, he's unable to fight off any real supernatural beings.
Authority Equals Asskicking: Noble clan leaders far outpower the rest of the nobles, and the lord is even stronger. Rai even praises the current lord, Raskreia, for being able to use a huge amount of power with just half of her soul weapon.
Awesome McCoolname: Aside from Cadis Etrama Di Raizel, we have Elga Kenesis Di Raskreia, the current lord.
Deadly Euphemism: When high-ranking nobles start talking about "proper courtesies", prepare to die.
Also, while "eternal sleep" sounds respectful, "forced eternal sleep" doesn't sound as comforting.
Elderly Immortal: Gejutel. His elderly looks has Tao constantly call him grandpa, which, while accurate (as he is Regis' grandfather), pisses him off.
Empathic Weapon: The noble clan leaders' Soul Weapons. They are the symbol of a leader, and materialize on command. Oh, and each soul weapon contain all of the souls and might of its predecessor wielders, so it gets more powerful with each generation.
Everyone Calls Him Barkeep: Noble lords. This is among the reasons why the previous lord is reluctant to give her daughter Raskreia the title of lord; he's worried about what would happen should her name be forgotten.
Generation Xerox: The only thing differentiating Rajak Kertia and his predecessor Ragar is the latter's ponytail.
Healing Shiv: Raskreia uses the half of Ragnarok that the previous lord left for Rai to refill Rai's dwindling life force. Of course, when Frankie sees her do that, he... doesn't take it well, until Gejutel explains. Even the previous lord jokingly chastises Raskreia for stabbing Rai with it.
Never a Self-Made Woman: The current lord tries to avert this trope, refusing to merge the two Ragnaroks her father split in order to gain srength with her own methods, earning her a post-mortem praise from her father.
Previous Lord: We want them to live their lives according to their own choices, not fate. We do not want them to follow in our footsteps; but to be able to choose the life they want, and live it as they please.
Video Wills: The previous lord left some for Rai and Raskreia, all of which are recorded inside the two parts of Ragnarok. Subverted with the third one which appears after Raskreia uses one half-Ragnarok to restore Rai's life force; This one really is the previous lord in person, if only a fragment of his soul, memory and personality.
Big Bag: If only because he has stayed out of the radar (and harm's way) most of the time.
Evil Genius: Though exactly how much is his own genius and how much is from Frankenstein's journal remains debatable.
Expy: Of Gendo Ikari in more ways than one. To name a few: his appearance, his personality, his lack of respect for life and nature in general, his working with an Ancient ConspiracyOmniscient Council of Vagueness, but especially how it's implied that he has no intentions of actually helping said council achieve their goals and is simply working with them to further his own, more sinister ones.
I'm Taking Her Home with Me!: She sends Yuriy out to kidnap a cute guy for her to experiment on. She's so delighted when she gets someone as good looking as Frankenstein that she has trouble deciding what to do, because she doesn't want to alter his looks or shorten his life.
This folder covers 4th Elder Roctis Kravei, 6th Elder Urokai Agvain and 7th Elder Zarga Siriana, plus three more: Laguz Tradio and two yet to be revealed. Their family (such as Roctis' daughter Ignes) will be put here also.
Tropes that apply to the traitor clan leaders as a whole:
Bad Ass Long Coat: Only Ignes hasn't been seen in one. Though she wears a lab coat when experimenting.
Evil Costume Switch: Back in Lukedonia, they wear the official black Lukedonian outfit. Once they defected, they switched to white.
Urokai accused Raizel of displaying indifference toward those who followed him (including Urokai); yet he took Frankenstein, a puny mortal, under his wings over other nobles (like Lucifer was dissatisfied with God because the God favored humans, over Angels)
The daughter of Roctis. Since her father is still alive, she has yet to inherit his soul weapon. As such, she severely resents the other nobles of her generation, who have all become far more powerful than her. Thus, she's come to rely on questionable experiments in order to compensate for her lack of raw strength.
Eye Scream: The first punishment Rai dishes out to her for torturing Seira, Regis and Rael. Had Roctis not interfered, she would have suffered more.
Mad Scientist: In a twist, because she is not an Elder, many of her inventions are credited to 9th Elder who collaborates with her.
Oh, Crap: Once she realizes it is Rai who infiltrates her lab.
The Resenter: She is doubly unhappy for being passed over the seat of Union Elder and for not having a soul weapon, both due to her father Roctis still being an active Elder.
We Can Rule Together: She offers this to Rael since he was in a similar position to her (His older brother was chosen to be the full clan leader, so he normally shouldn't have been able to inherit a soul weapon). He refuses.