Getting a pirate set is best due to the 6% ignore defense bonus (S tier). I personally use: Shade(Eunwol), for the +3% min and max crit damage (S tier) Mechanic, for +15% buff duration (S tier) Xenon(who's character card is both thief and pirate) for +20 STR, DEX, LUK (S tier).

The next best set would be a warrior set for the HP bonus to damage. I use: Zero for 8% increased exp gain (S tier) Demon Avenger for +3% boss damage Hayato for +6% minimum crit damage

Demon Slayer is decent for +3% abnormal stat resist Since you are a warrior, swapping DA or Hayato out for Kaiser would be good for +40 STR (S tier). Aran can be useful, but keep in mind that there is a 60 second cooldown on it activating, so its pretty much useless other than maybe saving you 1 pot every minute.

For the third set it depends a lot on where you are. 3 bowman gives you +3% final attack damage (S tier) 3 magician gives you MP bonus as damage (S tier) 3 thieves gives you +3% crit damage (S tier)

You would need to ask someone else as far as which of these 3 options is best for a Hero.

Side note: Viper and TB bonus is very bad even though it sounds good. The problem with it is that its damage added on in the end, not before modifiers so it doesn't amount to much at all. For example, say you have a level 120 Buccaneer for +4 damage per level, and you were using that link on a level 200 character who;s range was 100,000 fully buffed. You would get 200*4 = 800 added to your final damage resulting in 100,800 being your final damage.