MMXCM:
Axl: Middle. Fire, Ice/Water, and Lightning are common but not Ubiquitous. Axl would probably get better millage from Manhunter's Crit-vs-Human rate.
Cinnamon: Tough Call. She halves ALL Elements in-game, so I extend that to most Elements in the DL, and can use her Armor to get 2HKO Damage. She can still be Heal-Locked, though... High Light. Let her earn a Championship.
Marino: Said well by others before, Basically Feena on Swords Dance. Heavy/Godlike, and hope you can Status/ID her on Turn 1! Maybe Extreme Speedsters like Alena can get through the chain. "Next!"
Massimo: Slow. But if he gets that 2nd turn... It's just too bad he cries at ALL Elements except Water and Ice. And Status. Well, until you turn the Glint on as far as the Elements go. Still fits right in at Middle.
X: Yeah, Heavy/Godlike. Just barely misses 2HKO with Ultimate Armor (though Sub-Weapons take care of that nicely.) Still has excellent Damage on Turn 3, and is the only Hunter with a long enough Hyper Mode to do it one more time. (Plus the Armor halving Damage allowing him to use it an extra cycle.)
Zero: High Heavy. 2HKO with just Heat Haze; OHKO with just Black Armor. Massive Damage when you combine the two! "Hardly a fight" indeed. Until you get to guys that can OHKO at average speed (which Zero falls just short of). Again, let him earn a Championship.
BTW, Marino has 112% Average Speed with the Chakram (Speed Equip). What does Feena's Speed Options rate her?
Also, Dwyer: Hawkeye costs 5 WE. Marino can still Slot on 1st turn if you allow her 50%, but she'll definitely need to wait for 4th "Turn" to get her 2nd Slot in. Which brings her down by about 4650/2000 vs OK's post... and right in line with mine. (I have her slotting at 75%+, but would probably consider 70%. 60%'s... quite Iffy to me...)
EDIT: Changed my votes to align with the system on Elfboy's Intro Post. Still thought it was the old 25% standards...