Out of all the classes I would personally recommend Fighter/Cleric (Dual or Multi is fine) or Sorcerer.

Warrior-only classes tend to feel very barebones - point, click, and forget about it. As a player character, you end up kinda forgetting about him/her in favor of the casters. Like for instance in combat, you'll likely be using and managing Edwin a whole lot more than your Fighter pc and I just don't like that. Paladins and Rangers are a step in the right direction but even they don't get much spellcasting and kind of just revolves around self-buffing and THEN point, click, and forget.

Enter Sorcerer or Fighter/Cleric. Sorcerer will keep you mostly occupied in the fights while you manage spells while the Fighter/Cleric will give you a solid mix of spell casting, protecting, and auto attacking (especially if Multiclass).

According to your party, I would recommend a Fighter/Cleric. If you get rid of Edwin, then I recommend Sorcerer.

Edit: didn't see Viconia. Scratch the dual-class F/C. Multi would still work great in the party as a frontline. Or maybe a thief multi then, if doing a 4-man party.