The Current State of Affairs: Lady Duvali

Lady Duvali...
There is little known about this devil-worshipper. She favours the worship of Dispater, lord of Dis, lord of iron.
Luckily for her, her worship has not gone un-answered, and she has been granted a fraction of Dispater's powers over metal, just enough to be a better fighter. Without them she would only be an obnoxious fool with too many enemies.
She has an ongoing (if shaky) alliance with Ilifir "Ironhide" Masrur, and has permanent quarters in one of the outbuildings of the arena complex. She loves fighting, and so sticks around despite there possibly being better things to do.
What most people don't know is that Dispater has told her he has plans for her, and that she better survive until needed, but get stronger in the meantime. Hence the gladiator fights.

Lady Duvali Human Fighter 6/Disciple of Dispater 4 CR 10

Init +4    Senses S/L +0/+0   Languages: Common, Lizardfolk, Dwarven

Defenses AC 21 (+4 dex, +6 armour, +1 sld) Will +6   Ref +6   Fort +9

HP 59 (10d10)  

Speed 60 ft

Melee:

• Scimitar +16 (1d6+5/11-20)
• Scimitar +14 (1d6+5/11-20) and Scimitar +14 (1d6+5/11-20) and Scimitar +9 (1d6+5/11-20) and Scimitar +9 (1d6+5/11-20)

Base attack +10/+6     grp +13

Special actions: rusting grasp, iron hews, Power Attack, Combat Expertise, Iron Power +1

Abilities   STR 16  DEX 18  CON 10  INT 14  WIS 10  CHA 10

Feats : Disciple of Darkness, Combat Expertise, Power Attack, Improved Critical (Scimitar), Two Weapon Fighting, Improved Two Weapon Fighting, Two Weapon Defense, Weapon Focus (scimitar)

Skills: Jump +28, Intimidate +13, Climb +16, Ride +16

Equipment: +1 Scimitar, +1 Scimitar, +1 Mithral Breastplate, Boots of Springing and Striding, Ring of Ropes (2)

SLA:

• 1/day rusting grasp
• 1/day Iron Hews: Gain +3 to damage with all attacks made that round

Disciple of Dispater is a 3.0 class found in Book of Vile Darkness (mature audiences only). I've used it as-is, as I don't see much need to update it. It makes for good clean high-crit fun.
One other important thing about Duvali is that she is a sadist and a villain of the highest degree. The fights are specifically nonlethal, with magic items to prevent casualties. More of her fights have ended with "accidental" deaths than any other gladiator's. Even the team fights she participates in often have one or two deaths per tournament, at her hands. Usually her blades "just slip" removing the magic item before delivering the death blow. Only Masrur has a kill-count that approaches hers, and his usually are accidental, resulting from the opponent being actually just cleaved in two.
Design Note:
The Ring of Ropes is, essentially, a grappling gun, or an Indiana Jones whip. It can extend ropes to wrap around things, allowing her to swing back and forth, ascend things easily, grab things at a distance, etc. It cannot be used to grapple, disarm, bull rush, restrain, or trip others.