A character like that could definitely be achieved later on (it would be a Construct, and it would be awesome). Right now though the world is not too advanced. I do plan on making things more awesome in this world as time progresses (through time skips that take place over tens or hundreds of years). Also the loli thing could be possible to, but at a later date. So this 'standard RPG' thing will evolve as the RP progresses and things get to become more extraordinary. 

Right now Swashbuckler is your best bet, but if you still want something 'mystical' in a sense (and we already have a duelist character) the most powerful thing is currently Alchemy (from the get go, Magic sort of sucks in the beginning, but its supposed to). 

this RP is going to be Veeerrryyyyy long term. Its more of an RP that's not only about just the characters that travel in this world, but also how the world is changed and affected by said adventurers. 

However, I would allow this if you really want to do the Construct thing right now. Rare Discovery, your character discovers how to create a 'body' that moves with magic and maybe their goal is to become skilled and knowledgeable enough to create this body and find the proper means to transfer her own soul into it, this discovery in itself making some incredible advances to magic down the road in time. 

That is an idea right there.