Need a char build

[noob]

If you want spell slot nonsense you can try the following totally legit level 15 build:
step 1:take 10000 levels in all the classes.(that is relatively quick with pathfinder negative levels and the artificer class you can do that at level 4)
Step 2: become the spawn of an undead
step 3: have your master die and then take that prc that allows to get back all your class features and feats.
you are now under level 15 and have the class features of someone who have 10000 levels in all the classes and all the feats ever.

You can also try the following:
take levels in all the good classes you want and at each level get ressurected by a low level ressurection spell in order to lose a level in commoner(and so get a more and more negative level in commoner) thereby staying at constant level and getting more and more class features.