Merry is, in my opinion an under rated card. He keeps your Hobbits within Secrecy and pairs up with his best friends Sam Gamgee and Pippin incredibly well. He also gives you access to spirit within Hobbits which when taking a look at the other options, is something in itself. My favourite use for Merry is giving him a Hobbit Pony, with his trusty steed you can keep him upright within the questing and staging step and wait for enemies to appear to trigger him, if no immediate threats are worth exhausting him, you can commit to the quest at the end of the Staging step with his pony!
Merry also gives you access to the infamous Hobbit Pipe deck, should you choose to pursue that deckbuild. A solid card and a worthy look at in any Hobbit archetype and a fair low threat Hero, who can keep you there, outside of the trait.