Like we know we can become at lvl 60 another job.
Mercenary: Blade, knight.
Assist: Ringmaster, Billposter.
Magician: Psykeeper, Elementor.
Acrobat: Jester, Ranger.
Let's start off with a Blade.
Blade
Blade's are pretty strong, for blades you will need some penya to wear the right, good equips. At lvl 105 they do alot damage with Addoch. (Critical damage). I would suggest you 2lga's since they give you 40% addoch each. They own in pvp, try to get dex and sta when you're Hero.
Knight
They can be good in pvp since they have alot of hp, you'll need a knightert set and a lgba because they give HP%. You'll deal damage with the mercenary skill. Further on grinding grounds you'll use aoe and take all the monsters in your area.
Ringmaster
Pretty boring on musara, in my oponion. They support other people by their buffs and heal. They can also aoe.
Billposter
They cast the most damage in pvp with Asal. This is an skill. The damage of this skill depend on your amount of MP. I would suggest you a Wedge set with 28% mp and mp awakens. Then go full str for high asal. Remember you will have LOW hp. Also try to get speed, its good to have, and handle with.
Jester
Their damage goes on Critical's, go full dex. In pvp and on grinding grounds as well.
Ranger
They can be good if you got the right stuff. They can use ulti bows (jesters cant) so i would suggest a ranger instead of a Jester.
Elementor
Most of the time aoe, i dont like them to use in musara. I only like wind field
Psykeeper
They can satan (if ppl satan me ima gettin' sick of it) (satan is a sneaker type skill) and they will kill you by using powerfull skills.
Want anything to add? just post.