Allright,we will have a kick-*** Mary Sue,Legolas in love,a disapproving Thranduil-because the bad ada-in-law is also essential-,and a single-horned goat.Splendid!
By the way,I have two additions here:
a)Aragorn in the love story causing a love triangle because Itaril has a taste for early teenagers.Legolas keeps a grudge and guess how Gollum escaped
b)Since the goat is multicoloured,she must be the pet of Saruman of Many Colours.