Merry has always been a close friend of Frodo's even from childhood. He unexpectedly finds himself joining Frodo and the fellowship on the journey to destory the ring. Although he lacks the skill of a warrier, Merry is a loyal and true companion throughout the quest.
"I think we made a big mistake leaving the Shire Pippin"
"This my friend, is a pint!"
"The fires of Isengard will spread, and the woods of Truckborough and Buckland will be gone. And all that was once green and good in this world will be gone. There won't be a Shire Pippin"
"My point is, he is CLEARLY overreacting!"