Aroplane

Alec- A Royal Guard easily. He's widely acknowledged as one of the most powerful Vampires in the Twilight saga, and he's capable of incapacitating multiple Vampires at once. So it'd be an insult to place him in a lower rank.

Afton- Transitional Guard. His gift is crappy, and I subscribe to the headcanon that the rest of the Volturi, bar Chelsea, also don't like him. There's no way in hell Aro is promoting him, and Aro fantasies about kicking him out of the Volturi. Alas Chelsea loves him.

Corin- Corin is one of the Guard's who I don't really think has a defined rank? She doesn't really fit in any of the boxes, she doesn't attend missions or clean up the Castle. Her role is to keep the Wives content, and thus I don't think she leaves the Tower often. At least not often enough to justify giving her an official rank. That being said I think she has the cloak and pendant of an Elite Guard due to her role with the Wives, though people acknowledge her more as a floater Guard. Very important but with no defined rank.

Chelsea- A Royal Guard. Listen she holds the entire Volturi together. There's no way she's anything but the highest rank of Guard, because a)She actually is that important, and b)Because Aro wants to keep her loyal and happy. While all the Royal Guards are technically equal, I'd put her as the unofficial leader of the group and thus all the other Guards.

Demetri- I was on the fence between Elite and Common Guard for him, but i ultimately went for Elite. His gift is tracking, yes, which is a very common gift in Vampires, but his tracking gift is incredibly powerful, so much so that he can find someone anywhere on the world, whilst other trackers are limited to singular areas or only being able to track those close to him. I think it is the fact that his gift is so powerful that bumps him up to the Elite rank in my mind.

Felix- Per the rules of my own headcanons about the Volturi rank structure, Felix should technically be in the Lower Guard due to his lack of gift. However I'm going to place him in Elite Guard (partially because I'm biased because I like Felix), but also because it's to have someone the non-gifted Guards can aspire to be. It's important that they feel like there's a chance of progressing further than the Lower Guard. Especially because I believe that once you reach the Lower Guard you aren't leaving the Volturi alive, they have a 100 years in Transitional to decide if the Volturi is what they want and if it isn't they can leave after a handshake from Aro, but once you reach Lower and higher you are in it for the rest of your immortal life. As I result I think Felix is sort of the head of Guard for all the non-gifted Guards and someone who can aspire to be and take his place if he ever got killed.

Heidi- Heidi in my eyes is another floater Guard. She, like Corin, doesn't fit into the requirments of any particular rank because her job is a very specialised one, one only she does, and arguably only she can do it with the large amounts of people she has to make go missing without a trace about twice a month. However, like Corin I'd give her the cloak and pendant of an Elite Guard just because her job is actually that important and useful to the Coven, and it would be a lot more difficult to send all of the Guard's out to hunt for themselves. Though I do think she only hunts for the Kings, Queens, the Royal and Elite, and Cadet Guards, and perhaps particular members of the Common Guard. Everyone else has to travel out of Volterra to hunt for themselves.

Jane- Like her brother a Royal Guard. She and Alec were instrumental to gaining the Volturi's power, and are instrumental in keeping it. Her rank will reflect this. Plus I just love the mental image of these two tiny 12 year olds being higher ranked than practically every other member of the Volturi, who the vast majority were turned as adults, though I do think a few were also turned under the age of 18.

Renata- I'd put her as a Royal Guard due to the fact that she's only the Guard who gets to be a personal bodyguard to any of the Kings, and because I think Aro would want his personal bodyguard to be the highest rank possible to reflect the importance of her. Plus I just think Renata's gift is actually very cool as in theory it makes her and whoever she protects virtually unable to be killed though in practise this may be not be the case, due to Vampires like Bella and the fact that somehow her gift tanks the gifts of practically every other Vampire. (Renata is one of the few Vampires in the Volturi I think are physically under the age of 18. I think Renata was turned at the age of 17, despite Meyer saying 20, as it makes Uncle Luca even creepier and Aro plucking her out of her old life and putting her in the Volturi that much more powerful, and makes her intense loyalty towards Aro more realistic even if we can just handwave it away as Chelsea's doing. Just let me have this headcanon. Plus mental image of her being Aro's bodyguard, again amusing, she's 5ft, about 17 and very unassuming but she's a Royal Guard and bodyguard to one of the leaders of the entire Vampire world.)

Cadet-Cadetta (feminine)/Cadetto (masculine)

The lowest of the ranks, these Vampires aren't actually part of the Volturi yet, but rather training to join. Someone needs to have been a Vampire for at least 5 years before they are eligible to train as a Cadet. They train almost nonstop for a year with numerous tests thrown their way.

These tests include fighting tests, control around blood tests, taking orders and obedience tests, and tests on how they cope/react with stressful situations. The Cadets remain in the castle for this entire year and they all, usually a group of about 30, share one singular dorm during this year where they hang out/get ready.

These Cadets bear a white cloak and no Volturi pendant. No gift is required for this rank.

Anyone who passes moves on to the next rank.

Transitional-Transitoria (feminine)/Transitorio (masculine)

These Guards share in rooms of about 3 to 5 and have their own common room where they can hang out. Their main duties are cleaning the Castle and helping to dispose of bodies after feedings, and sometimes they may accompany higher ranked guards when punishing a Coven to bulk up the numbers to make it seem more intimidating.

The Guards in this rank spend a lot of their time sparring and training in fighting, as well learning different key languages and Vampire history. However most of them will never see a proper fight or battle, as they are more show Guards than anything else.

These Guards bear a cadet gray cloak, and their Volturi pendants are crafted out of cheap metal and plastic stones. As a result these pendants break easily so a lot of them are made. Guards in this rank must serve for at least 50 years before they apply for promotion and even then most Guards spend 100 years as a Transitional before they are promoted. No gift is required for this rank.

Lower-Inferiore

This is where the vast majority of Guards are placed. The emphasis on cleaning and chores is less pronounced in this rank as they are often sent to deal with minor troublemakers themselves. They continue their fighting training, but the focus on learning new languages is less pronounced as their duties are now more time consuming, and they should have learnt most of the basic required languages whilst in transitional.

These Guards share dorms in about groups of 3, though they aren't required to live in the Castle and can instead apply to live elsewhere so long as they remain within 1000 miles of Volterra. They also have their own common room.

These Guards bear battleship Gray cloaks and their Volturi pendants are crafted out of better quality metal with glass stones. Guards who have reached this rank can no longer get promoted. No gift is required for this rank.

Common-Comune

This rank is almost exactly the same as the Lower Guards, except the Vampires in this rank have gifts. These Vampires due to their gift go straight from Transitional to Common, unless their gift is especially crappy and then they remain in Transitional.

Their duties are almost exactly the same as that of Lower Guards, except their training includes training with their gifts. And they are often sent on more missions. These Guards share rooms in groups of 2 and have their own Common room.

They bear a carbon gray cloak, and their Volturi pendants are crafted from decent quality metal and cheap gems. They have a chance to be promoted to the Elite Guard but it is rare. A gift is required.

Elite-Elite

This is near the top end of the Guard structure, and things such as cleaning the Castle and disposing of bodies don't exist for these Guards. These Guards all get their own rooms with an en-suite bathroom (E.g. Shower, sink, bath, vanity), and only responsible for keeping their own rooms clean. The common room for these Guards is shared with the Royal Guards and is incredibly well furnished with a variety of enrichment items like X-boxes, a mini library, pool table, Tv's and other such things.

These Guards receive much more leisure time as their only responsibility is attending missions and training their gift or fighting skills every so often unless they are being punished.

Their cloak is arsenic gray, and their Volturi pendants are crafted out of real gold or silver (depending on the Guard's preference), and inlaid with expensive gems. These Guards are allowed to make adjustments to their pendants such as having something engraved on the back. A gift is required for this rank (The only exception is Felix.)

Royal-Reale

These are the very, very top end of the Guard's that very few are actually in. They receive their own private rooms with an en-suite bathroom and walk in closet. They have the most leisure time out of all the Guard's due to only having to attend the very important missions.

These Guards are also allowed to leave the Castle/Volterra whenever they want, unless they are under punishment, whilst all lower guards have to receive permission from a King or a Royal Guard to leave, apart from Cadets who can't leave at all. The only stipulation is if a Royal Guard leaves they must remain contactable through a phone, and they must send a message to Aro saying they are leaving, so they can't be accused of desertion.

These Guards receive charcoal cloaks and their Volturi pendants are crafted out of real gold or silver, again depending on preference, and inlaid with expensive, quality gems. They are allowed to have engravings on the back. These Guards are always gifted, and the gifts are always powerful.