One things for sure, i would have liked a lot more new characters in general to SCV rather than just Z.W.E.I. and Viola since technically we already knew about Patroklos and his sister through story. and good ol' maxi's babysitting job/group are nearly clones.
Would like characters that look sorta like this and there weapons/designs to show up in SCVI if one is ever created. [The following pictures are examples of such characters from a great and talented artist from Deviant.]
Weapons: Long Sword + Tower Shield
Gender: Male
Classification: Heavy German Knight
Height: Very Tall
Traits: High defensive, long reach, poor offensive, slow
Ethnicity: German
Allegiance: Good/SoulCalibur (With Siegfried?)
Weapons: Kunai, smoke bombs, shuriken, hidden needles, teleport
Gender: Male
Classification: Male Ninja (With a much more violent style as opposed to natsu's)
Height: Short
Traits: High Speed, average damage, decent range, weak defense, slow Critical Edge
Ethnicity: Japanese/African
Allegiance: Neutral (Hired help?)
Weapons: Giant (Holy) Two-Handed Hammer (Not like Rock, a much more spin based and swingy version with girly animations thrown in)
Gender: Female (Because a female character, a petite one at that wielding a big ass pally hammer would be hilarious)
Classification: Paladin
Height: Short
Traits: Very high single hit damage, very weak combo's, high defense, very slow overall, slow movement
Ethnicity: British
Allegiance: Good/SoulCalibur
Weapons: Dagger, Explosives (Almost like the one from SCIII)
Gender: Female
Classification: Dancer/Thief
Height: Average
Traits: High speed, tricky movements, good combo's, decent long range damage, weak defense
Ethnicity: Egyption
Allegiance: Neutral
Bangoo... since in general he was very highly requested upon. he could wield bow and arrows along with close range weapons to make him a clone of Link or something.
Weapons: Twin Chain-Blade Whips (Not to copy Ivy's, his dual weapons would remain in a chain-blade whip state)
Gender: Male
Classification: Soul Edge Minion (Like Tira plot wise, but with a dude, could have had potential to be tiras brother, partner or something?)
Height: Tall (To match the great range of the weapons)
Traits: Moderate damage, moderate speed, moderate defensive, extremely high range, very high critical edge potential, high combo potential
Ethnicity: Fantasy (Hey why not? we have a flying lizard that breathes fire in the game now, a guy who can summon a werewolf, and a girl with a floating crystal ball...)
Allegiance: Evil/SoulEdge