Fastest attack speed?

Class	# hit	hits/sec

Warrior
DK	8	12
Hero	6	46
Paladin	7	62
DemonS	15	52
Aran	10	31
Mikhail	6	39
Not seen in this film: Kaiser, Hayato
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Magician
F/P	15	48
I/L	12	53
Bishop	10	30
BaM	8	54
Evan	10	40
Not seen in this film: Luminous, Kanna
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Archer
Merc	12	38
BowM	10	41
MarksM	10	39
WildH	8	6
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Thief
Shad	10	91
NL	6	33
BladeM	8	101
Phant	10	56
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Pirate
Bucc	8	25
Corsair	6	24
CannonS	10	44
Mech	8	38
Not seen in this film: Angelic Buster
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quote

Single Target uses Ring of Ishtar. Legendary Spear is used 1s before its duration wears, and a Strike Dualshot is used in mid-air while falling. All buffs are recasted at once to reduce Ring of Ishtar startup time.
2~4 Targets uses Strike Dualshot, Unicorn Spike, Lightning Edge, and Legendary Spear, all whenever available.
5~8 Targets uses (Unicorn Spike), (Legendary Spear -> Leap Tornado -> Gust Drive), (Lightning Edge), Charge Drive -> Rolling Moonsault -> Leap Tornado -> Gust Drive, repeat, with skills on cooldown when available. This combo does not include the bonus damage for monsters being in mid-air, since that does not apply to bosses. This is under the assumption you can perform the full combo, which isn't always possible. Unicorn Spike means you're vulnerable, and Legendary Spear has no invincibility frames either, but Legendary Spear is rather necessary for optimal damage. Unicorn Spike isn't as necessary, but helpful.
Also added a check to recast Elemental Knights when the cooldown was up if the Knight was not the Neutral one. Double checked and the damage over time from Fire Knight does not compensate for the damage difference Neutral does, though is very close, it is within ~20%/s. It's most important to recast Ice Knight since it's the weakest, and Fire Knight can have elemental disadvantage.
The bonus damage from Unicorn Spike is idealised to be applied equally on all monsters if it activates, since it takes too much to consider the perfect scenario where each monster has its own individual activation rate, and certain skills (Gust Drive) do not lower the count on the seventh and eighth monsters. Nine and higher monsters is only the extra damage that Legendary Spear does to them. No other Mercedes skill can hit higher than 8 monsters.
There's some higher variance in the %/s for Mercedes due to the nature of how the calculations run, but it should be within +/- 100%/s for 70% defense targets.
I've added Threaten and Sharp Eyes for comparison. As you can clearly see, as you gain more defense ignore, the closer your damage against defense approaches your 0% defense damage.