[@Mega Birb]
Eve may be fast... But she's got no attack powers that hurt the enemy without hurting her (As building up momentum prior to striking and colliding is her only real attack method), and her lance is woefully underwhelming against the power levels set by other weapons. If you gave her a decent weapon she might move up to solid mid tier as a duelist, but she's really not got a versatile or OP enough powerset. Also, calling her the fastest is pretty silly compared to the ludicrous speed-sets some of the other characters have.

[@Lucius Cypher] Back on the Subject of Grafdakka, I like to rate characters on three metrics:
Duelist: How good the character is in a one v one or other small fight. A lot of this ranking is based on the character's dodge, accuracy, the versatility of their powerset's attack type moves, and things like that.
Power: What's the power level of the fighter? Can they break through Zeruel's shield, or Torag's defenses, or other "You must be this high a power level to get to fight me" things.
Battlefield: What's their ability to affect the fight as a whole? Do they dominate the battlefield when they enter?

For example,
Victoire would be:
Deulist: Low-Mid, she's got versatility, and tricks up her sleeve, but there always seems to be cast times and preparations needed, and her physical capabilities are low enough that she's got a glass jaw.
Power: Mid, she's not particularly high raw power or low raw power.
Battlefield: Borderline Faction-Leader, between her long range communication, portals, and most importantly, demon flowers, she tends to win the battle without ever winning any fights within the battle.

Grafdakka would be:
Duelist: Low-Mid, if it weren't for your ability to easily sacrifice parts of yourself to trade blows advantageously, and your occasional clever "taking you with me but I've got higher durability" moves, you'd be lower than Miyu on this list. You're just such a big and unmaneuverable target when on open ground or in the air, and none of your ranged weapons are flexible or powerful enough to give you any real options other than "CHAARGE! PLEASE STAND STILL AND TAKE IT!".
Power: Borderline Faction-Leader, Zeruel's withstanding your chainsaw was dumb. You've sacrificed every other category for this one thing, and you should be the best at it.
Battlefield: Low-Mid. Used to be mid tier when you still had a nuke, as those allowed you to really make a difference occasionally. You really only have the ability to seek out and destroy targets, but with how bad Grafdakka is at a duel, you really have to hope the enemy doesn't have a dodge stat. If you had fixed emplacements to destroy or "destroy this shield to allow us access", you'd have some ways to shine, but as it is, it's a wonder you're doing as well as you are well.