Voldo is super safe, has great mixups, and does good damage with basically everything. Good CF damage is icing on the cake.
Excellent and those are all plus type stuff. Though let's break that down.
You can block Setz 1A

A on reaction? I gotta see this......
I'm starting to think so but not sure yet. It reminds me of Steve's DR Down-Back 32 where its unseeable but the range is so gimped that often the only way to land is through wall pressure. Because you have to get so close it becomes somewhat obvious even thoughit is unseeable. With Sets its the same rules but it also looks seeable.
Yeah. The reason Voldo is so good is he's safe after practically *everything*. And then aside from the inherent frame recovery style safe, he's also safe because half his moveset tech crouches and the other half tech jumps.
Safety+Insane damage+crazy mixups+great (if limited) RO game+evasion+throws that sidestep+what is probably the best SG game=top tier.
In my opinion, while Algol and Hilde are in a tier of their own, I think Voldo is better than everybody else in the game.
It's like
S tier: Algol, Hilde
A.5 Tier: Voldo
A Tier: Kilik, Amy, and supposedly Setsuka (but I don't know her well enough to comment on her)
This is for both Tiamat and u:
The thing is just how much is enough. Theoretically on paper and such all those things are phenomenal but how much of it is neccessary in a match. You will often find that using every last bit of a character's movelist is unnecessary may even limit or create problems for u in a match. So here are some some questions. How often do people use unsafe moves per character? What are other characters SG damage in relation to Voldo and how practical is it? How much damage can other characters do in relation to Voldo and how practical is it? Is that characters mixup while maybe not as good as Voldo's able to get the job done? Does that character even need a serious mixup?
With that said quality is needed here not quantity. You want to stick to the
Juice.
What yields the best results and get's the job done in the fastest most efficient manner.
It's like Steve from Tekken. He has no real mixups if any at all that are practical besides a poking low. He is a CH hunter who has to try much harder to land juggles. Can't punish on block with a launcher like other characters can making more moves abusable vs. him. However he still is top material because what he has when he connects hurts and his keepout ability makes you question attacking him. The same rule applys to him in BR now but he is #1 again because mostly he hurts when he hits even through all the hard work.
Here's my argument:
Hilde: No mixup all though some of her low pokes can be annoying. Pathetic damage outside of C3B and C3A. Throw game is average outside of 64B+G near wall, no threatening SG damage. However we all know why she is high as even though she is restricted what she has her Step, C3A, C3B, C2BB are to damn good in order from best to least best.
Algol: What would Algol be without bubbles. Still strong no doubt but I imagine he would be B-Tier maybe less. Between his throw damage, extremely annoying hit & run lows with retarded range and weird stunning ability, and his bubbles phazing out more than half the cast that's it. Really simple and effective.
Kilik: Has viable and unseeable lows that all do a number on the SG even when blocked. He more so benefits more than his past appearances in SC because of the addition of the SG system. As a result the fact that he can box out at mid-range to far-range is even more threatening. The pushback off of some of his moves like WSB only help reset that distance. His throw game is Superb to Phenomenal because of damage and ringout ability. When people invade his space traditional basics like step movement hurt because of step A+B. His 22/88 B or his 1B yield phenomenal step results as well and also work the SG at 10 and 12. Arguably the best post GI setup with a mixup of A+B=80-Damage, FOTD A+G 80-Damage Ring out right (for those who air control right replace Asura with 3kB for the ringout), FOTD B+G Ring out left or wall bounce into oki. WSB is insanity an all around better than it's previous outings as it defines who he is and has so many good qualities even though its steppable (a little jittered motion can fix that). It has pushback which works with his design, techs highs, evades backwards (with proper spacing u would be suprised how many things you can make someone whiff), 54-Damage into oki, respectable SG numbers at 14. Asura Dance isn't even neccesary because of his regular GI options. Because its guaranteed though its a beautiful counter. I would argue that its useful more for its tech jumps.
Setsuka: Hard as hell to use and master. At first glance she even seems not all that great (which would explain why most people are unaware of her power). Seriously people need to start imagining, looking at her vids, moveset, damage, how she can fight up close or far, how she moves, phenomenal throw game, her wave-dashing ability closes space, induces hesitation, disguises strings, and her backwards version is hella evasive and is better than a back step. For those who can GI fairly well or even a few JI hello free Sakura Moon Combo or many other options of her A+B. She has no real lows outside of 1AAA which the value of is still undecided. Her options are so damn strong that its not needed. Her WR 3a:B is at i12-Frames so she is punishing almost any blocked low. I could go on and on about her.
Amy: Well do I even need to explain. This bitch is annoying lol.
The only person I can see him being in front of out of all the above is Sophie. As the work for her to get the job done is way to hard in reference to how Voldo can get the job done as well as the people already above her.
Though I wonder if she is top B-Tier material or last A-Tier material.
When I look at all the above I simply do not see Voldo as good as the above.
Which is why my tier list is now.
S: Hilde, Kilik, Algol
A: Setsuka, Amy, Voldo, Sophie