You say fighter is boring. Here are some suggestions for builds :
1)multiclass with barbarian, take the feats extra rage and leap attack and calculate the damage that character does
2) Take improved trip with spiked chain as mentioned above or fight with 2 weapons and boots of speed (8 attacks at lvl 12)
3)Open the feats in complete sqoundrel and see which classes can be joined with that of the fighter's ( i once played a martial stalker, fighter-ninja, and was very efficient )
You can find other builds also great and as far as the rp is concerned it is up to you. In one of my campaigns as a figther i was the personal guard of a wizard in the party and made gold out of that
There are many things you can do.Of course fighter is not as interesting as a spellcaster but he is no boring for sure
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