FIRST of do a list out of the female in bot of the shows.
1)willow she is connected with everything
2)buffy (with scthy) and that weapon could kill illyria.
3)Glory hell god but buffy brayed her a couple of times.
4)illyria she a pure demon.
5)faith. she weak compare to the list lol: king :
Are you referring to the "strongest" as in physical strength? (who could lift the greatest weight using muscle power alone?)
PROBABLY Illyria before her powers were reduced, with Glory running a close second. Willow would be dead last, because she has no more than normal human strength.
Or, are you referring to the "strongest" as an implication of the most proficient fighter? (as in "put them all in a ring, no holds barred, slug it out until only one is left standing)
In that case, I would again say Illyria, with Buffy coming in second, because she has figured out a way to defeat or at least fight to a standstill all of the others, magically enhanced Willow included.
The fight would probably go something like this:
Faith, always impetuous, would go after the most powerful being in the fight, Illyria, and wouldn't last long enough to blink.
Willow would try to use her magic to take on Glory with almost the same results. Will would live long enough to blink a couple of times.
Illyria, after taking out Faith, would go after the strongest remaining opponent, Glory, and twist her head off.
That leaves Buffy to face Illyria, and our favorite Slayer only comes in second.
Game over. Illyria takes the crown.
