Character Card System

Set 1 pirate set:
Mechanic for buff duration
Xenon for stat
eunwol for min crit

Set 2 nothing special:
Kanna for boss dmg
Beast tamer for ignore def
Marksman for critical (this isnt so useful for bossing, past 50% hp you will crit nearly all the time)

set 3 warrior set (I know it sucks but its a free bonus):
Da for boss dmg
Hayato for minimum critical dmg
ds/zero/kaiser status resist/exp/stat

There are probably some better options, like if you dont need status resist ds will be useless, if you dont need crit past 50% hp marksman will suck & if you dont grind zero isnt needed either. Im not sure if corsair/jett card works with the copy skill that eunwol has aswell, if it does, then get both of them aswell.

You could probably remove Mech as Eunwol literally has only 1 active buff which isn't a hyper skill, and that's the one that blocks up to 3 sources of damage for 30 seconds and has a CD of 60 seconds. Even though I play in KMS, so my card set-ups are largely different, I believe this would be a better set-up for Eunwols in GMS

Set 1 Pirate set (PDR %):
AB for Dex (yeah it's minimal, but it still adds to the damage)
Xenon for stat
Eunwol for min crit and max crit damage

Set 2 Mage set (% MP to Damage):
Kanna for boss dmg
Beast tamer for ignore def
Evan for MP regen/ F/P for MP (Ever since they changed Spirit Bond so that it doesn't regenerate MP anymore, you do run out of MP really fast and it is pretty damned annoying as well)

Set 3 Warrior set (% HP to Damage):
DA for Boss Damage
Hayato for min crit damage
Zero for exp (If you're still planning on training)/ DS for stat resist (If you're bossing)/ Kaiser for STR (for more damage)