It's not as funny as a flesh-and-blood character explaining that his physique is ... masterwork - the perfect tool for the job, IYKWIM.
well, my verbiage was different, but without thinking i did once in character state that my monks body is a masterwork weapon.
my exact quote? upon the dm inquiring if i was masterwork quality or not i replied:
"my entire BODY is a masterwork weapon!"
there was dead silence for a moment as everyone else in the group just looked at me, a middle aged, chubby, overweight, slightly balding guy making that statement with a straight face. i was unaware of the double entendre as i said it, but once everyone started busting out laughing, i got a clue. *^^*
i then defended my statement by saying that the races were the works of the gods, and if the handiwork of the gods isn't masterwork, then i didn't know what was. the dm allowed it in campaign, but i'm not so sure my defense was the reason. ^^
personally, i think that any character who is willing to lay there for the amount of time necessary for some wizard to embed spell components into the flesh of said character and cast spells on them, should be allowed to be enchanted. but, that's rp, not mechanics.
realistically speaking, i might require each major portion of the body to be enchanted separately (arms, legs, head, torso, others if applicable.) but it's such a fun idea, it should be allowed.
it should also leave interesting marks and scars, perhaps readable by any who have sufficient knowledge arcana to figure out the exact enchantment. not to mention having valuable gold, gems, and other materials embedded into the flesh might make for interesting treasure. which further reminds me of that feat in savage species regarding regenerating creatures pulling off limbs, using them as weapons, then reattaching them. which should absolutely get the returning enchantment. and then i can see when the monk dies somehow, the rest of the party hacking off the limbs to use as weapons... yeuch. =P
and you know someone will not only do this, but want to know the rules on how long it takes for the limb to decompose and is still usable as an enchanted weapon. enter gentle repose....
and now i just had an idea for a race or culture of monks where the ancestral weapons are literally the preserved limbs of their actual ancestors... and undead grafting. yeah. argh. now i need to stop my imagination before i get completely carried away. ><
i would also think it humorous if said arcanist was able to figure out the command words and randomly trigger the monks enchanted abilities in inconvenient social situations.
"ah yes, i'll be happy to add my signature to this major treaty bringing peace between these three nations...." arcanist mutters monk's flaming ability command word in the background....
*fwooosh goes the treaty document*
if the player was willing to accept such a limitation, that of the command words being discoverable, just like any other magic item, i would be all for allowing them any enchantments they wanted.
...hope they can fly and breathe when someone activates the monk's brilliant energy property while walking over stone or dirt. ^^ hmmm, not to mention the issue of clothing.... kinda hard to fight when all your items and clothing falls off every time you activate a given ability.