Does anyone here know javascript...

[Hunter of Shadows]

I was playing minecraft one day, and building a castle, a big one, and whimsically I named it Brennenburg Castle, and it occurred to me, how awesome it would be, if there was a mod that would let you make your own servants

Have the grunt and brute be your faithful gatherers.

I'm not sure how hard this would be though, does anyone here know enough javascript(and about minecraft) to be able to tell me how hard this would be?