To be honest, I'd recommend going for Sniping Ranger>Grand Archer as Rena since it's her most powerful class. She has the all powerful 'Gungnir' which is the second most damaging skill in the game. When combined with her buffs, it becomes the most powerful in terms of damage. Combat Ranger>Wind Sneaker is her easiest class to use when doing PvP since her Sharp Fall is a brain dead skill. Trapping Ranger is weak. Very weak. It's the worst Rena class to choose for PvE. It does however, do okay in PvP. The class does become better once they release Night Watcher, but it's still the weakest out of the Rena classes.
What do you mean by learning Eve or Elsword as worst? Those two classes are some of the most powerful classes in the game.
-Elsword>Sword Knight>Lord Knight is the most powerful class in the game (When it comes to PvP). He has all the skills required to help in any given situation. His Armageddon Blade makes up for the lack of range by multiplying his attack range by 5x, allowing for faster dungeon clearing or not letting your foes escape in PvP. He has a combo that can almost 1 shot any boss (or character) given that he has the damage to back it up.
-Eve. My favourite female character in the game. Any class is fine with Eve but my preferred class to change into with her are either Code Architecture(CE)>Code Empress(CEm) or Code Electra(CEl)>Code Battle Seraph(CBS)(Seraph hasn't been released yet except for in Elsword KR and JP). Both are outright monsters in the PvP and the PvE world. One specialises in powerful single hit skills while another is multi-hitting skills. Architecture is more of a close range class while Electra is more zoning based as she utilises lasers as her weapon. At low levels when it's unlikely that you'll have a good weapon, it might be better to pick Electra over Architecture as Architecture is generally more skill based. I will also say that I prefer CA to CEl because Architecture is a boss destroying class. Electra is also, but she doesn't kill bosses as fast as Architecture does.
It's a shame that you didn't want to go with Raven, Selvaria. He's the character with the 'cool' factor in the game. Blade Master, Reckless First, and Veteran Commander. Take your pick. Neither will disappoint but if you want a challenge, pick the Blade Master class. It's the most hardest class to master in the game as well as being the classiest in the game. The BM class was the first class I played, though the only reason I picked it originally was because Raven's Japanese voice happened to be Miyano Mamoru.
I forgot to mention, if you guys don't like the Elsword voices, I recommend a voice patcher to change it towards your tastes. Either Korean or Japanese are the best to choose. Here's a link:
http://www.elitepvpers.com/forum/elsword/2181167-elsword-jpatcher-complete-voice-packs-all-clients.html
Have fun playing Elsword, Elsworders. :>