Well this is gunan be my second guide. Jester was the 2nd class i made on flyff and its my Favourite.
People have been asking me a lot on Jesters so i decided to make a Guide.

Bow Jester

Str - 15
Sta - 15
Dex - xxx
Int - 15

Lmfao i know this looks wierd but, Yea people have asked me Bow Jester build so i'll post it.
For Bow Jester Use Cruiser/Hyper Set And Guardian Bow Till Level 90. At Level 90 Switch To Restra/Rasra Upgrade this set as much as you can becuase you will use it forever. And Get Angels Bow.
At 105 Get a LGB And Upgraded becuase you will use it forever until u get Bloody Bow.

Yo-Yo Jester

Full Str:
Sta - 15
Str - xxx
Dex - 15
Int - 15

This Build Is GODLY. Your Looking at a Blade Here, with just a higher crit rate.
This build requires you to Spend MAD money.
If you are poor, not to be mean but this build is NOT for you.
For This build you will use Cruiser/Hyper set till 90, and then Restra/Rasra Set Forever, and upgrade this set to +8 or +10.
Use G.Yoyo till 75 and once you get Historic Yoyo Kiss It, Get it to +10, and keep it forever.
Use Areks Highly upgraded for this build. Enough to get you about 80 Dex Buffed

Str/Dex Build:
Sta - 30
Str - xxx
Dex - 43 Or 63
Int - 15

This is A Good Build.
It gives You decent amount of Crit and Damage.
For this build use Str Rings NOT AREK.
Use Cruiser/Hyper till 90 and then Rasra/Restra Forever.
Use H.Yoyo Forever And upgrade it High as possible (Also get Bloody Yoyo if you can).

Dex/Str Build.
Sta - 30
Str - xxx
Dex - 93
Int - 15

This build will give you around 100% crit rate.
It is fast but lacks str damage.
Use Cruiser/Hyper till 90 and then Rasra/Restra Forever.
Use H.Yoyo Forever And upgrade it High as possible (Also get Bloody Yoyo if you can).

Skills
Yoyo Mastery - MAX
Perfect Block - MAX
Dark Illusion - MAX
Enchant Poision - MAX
Critical Swing - MAX
Enchant Absord - MAX
Back Step - MAX
Fatal Stab - MAX * For Pvp *
Hit Of Penya - MAX * For Pvp *
Fast Walker - MAX
Cross Line - Level 15
Counter - Level 15

Tips

* At Higher Levels use Enchant Absorb rather than poision because if you poisioned a mob and get aggroed by 2 other mobs, and if u DI, the poisioned mob still receives damage causeing you to come out of DI early and you can Die

* Fastwalker/Backstep/Cross Line are all very helpful skills to use while leveling. Backstep/Cross Line can stun your enemy if it attacks your partner, and Fastwalker can get you to saftey faster or help your partner or even get to mobs faster.

* If you are Rich and want to level Fast, You can HOP Level. HOP Leveling is when you get a RM and have it HC a mob and then you simply HOP it.
This usually Results in a 1 Hit K.O. and is Fast. Costs MAD money tho :P

Well thats my guide:)
I hope it helps you future Jesters to be
My IGN's Are;
Vamp
Earth
Wizard
Monster

Feel Free To PM Anyone of them in game at any time.
I would be more than happy to help you!