Additional Stats
Apparent age: Stopped aging in his 50'sActual Age: At least 485
Soul Edge stops it's user from aging but will possess them in the process. Soul Edge also is powerful enough to influence those it's connected to, even if they don't use it. For example: Ivy's father was possessed by Soul Edge. She stopped aging in her mid 30's. Decades of caretaking Soul Edge but not using it has resulted in him not aging.
This lack of aging is actually apparent in the games. Other characters like Sophitita age normally. But Voldo has barely changed at all outside of new costumes. The comparison image on right compares Sophitita and Voldo as an example. If he really doesn't age, there's a good chance he's still alive today.
Personality
Despite popular belief, Voldo does have a personality. It just takes a little careful observation to notice it.
Voldo is actually cleanly and cares about his health.
Ever notice how he never has eyebrows or any body hair at all? This hints that he isn't bald because of age: he shaves his whole body. Back before lice treatments were a sure thing, people would simply shave their whole bodies to prevent lice. This kind of behavior means he knows that the Money Pit is not a healthy place to live and is taking efforts to stay clean and healthy.
The mouth and eye covers actually serve a purpose.
Eyes are a weak point. Even if you can't see through them, eye injuries still hurt. Voldo is covering his eyes to assure that nothing gets in his eyes. The mouth covering is basically a mouth guard in most costumes. He's trying to protect his teeth and/or keep dirt and water out of his mouth. Considering that he already has shown to care about his health, wanting to keep things out of his mouth and protect his teeth makes sense.
He also cares about his appearance despite being blind.
Considering that most of his outfits have harnesses and armor pads, it would be very easy to mix and match parts. He could just grab anything and put it on, but that's not how he does things. Voldo's clothing and armor always match. This means he is taking effort to assure that he keeps matching outfits together and is careful in what he wears. He wouldn't bother doing this unless he cared about his appearance.
Voldo knows about and uses intimidation tactics
Not having to fight an ememy saves time and reduces risk to one's health and safety. Voldo clearly has an understanding of how he looks, too. So why not use his appearance to intimidate the enemy? This would explain some of his outlandish costume choices. It also would give a secondary use to shaving his body and wearing eye and mouth guards.
He's a deeply loving guy who uses acts of service as a love language.
There's many ways to show you care about someone. One way is known as "acts of service": you choose to do things for the one you love. Voldo in canon loves Vercci. So he chooses to serve him wholeheartedly with all of his body, mind and spirit as a way of saying "I love you". I personally suspect it's a romantic love, too, as frankly people aren't likely to kill dozens of people then hide on an uninhabited island for just anyone. And he's been at it for decades! Now that's some serious deep love.
He's really devoted and loving, not insane.
So far we have established why Voldo looks so strange. We have also established that he does baasically everything in the games out of love. Insanity would mean there's no rational reason behind his behaviors. But closer examination reveals he is rational. Voldo is sane. He's just so deeply in love he looks crazy.
Random extrapolations
Favorite foods: Coconut, especially young coconut or macapuno
The Money Pit was on an island that was far enough south to be able to grow coconuts. Coconuts are nutrious, easy to prepare, and store well. Young coconuts and macapuno are the tastiest versions and both can come from wild coconut trees.
Favorite animals: Cats and rats
When Voldo killed the sailors, he had no reason to harm the ships' cats. Long ago ships always had at least one cat on them for longer voyages. The cats were a source of morale that helped keep rats and mice at bay. The decendants of these cats stayed on the island with Voldo and served as companions. There's also multiple official pictures of him interacting with rats. Rats are easy to tame and make great pets, so he might have had pet rats as well.
Favorite enterinment type: Music
Music is still accessible even to the blind and used to be a special thing you had to go out to enjoy unless you were wealthy enough to have a house musician. His fighting style in-game is marked as "dancer". Dancer... music fan... makes sense. I can picture him especially being into complex melodies (ex: Jazz, trance, metal, classical) as there's more to interact with.
Tea of Coffee?: Tea
After years of being on the island any leftover rations had to have expired. Old hardtack gets musty, turns brown, and has a mealy texture. It's like stale coffee but nastier. The smell of coffee might be OK, but the taste would remind him of rancid hardtack. This makes him a tea guy.
He probably has PTSD:
He spent decades of being isolated on an island with no human contact except for random attacks. The only times he left the island resulted in him being attacked over and over again. All of this is a recipe for PTSD.
He likes quiet elegance:
His youth was spent serving the very opulent Vercci. Then he spent decades guarding a place full of expensive treasures. He's used to refined elegant things. But the isolation and PTSD make him not do very well in loud, fast-paced places. Quiet elegance makes him feel at home.
Thoughts on Vercci
The source is vague on Vercci, but I have tried to gather things based on what I saw. It mentions that Vercci was a proud man driven by wealth. He cherished things, not people, and frequenty made grand displays of his wealth. He didn't care who got hurt in the process, which is why his nickname was "The Merchant of Death." At no point does it say he actually cared about Voldo, though occasionally it mentions him praising Voldo for a job well done. The closest to actually caring about him in-canon was that one time his spirit warned Voldo not to touch Soul Edge. That's it. That's all I could find.What I think happened
Chances are, Vercci is the first guy Voldo ever loved. He didn't know that he should have been treated better. He just suffered through it all in the vain hope of being loved back because he loved him too much and was too devoted to walk away.
Voldo gave Vercci all the best years of his life and served him with utmost faith, love, and loyalty. And what did he get in return? He was treated like a living weapon and used as a tool for years before being sent to an empty compound on an uninhabited island as part of the weapons collection and/or to guard Vercci's stuff. Did Vercci even love Voldo at all, or was he just too useful not to keep near? Were Voldo's fanciful outfits and beautiful weapons meant as gifts, or mere decorations for Vercci's favorite weapon in order to show off Vercci's wealth? And after death Vercci's spirit would go years without visiting Voldo with zero explanation leaving him heartbroken, confused, and utterly alone.
Voldo deserves better.
Return home?