I actually have to agree with
Galadriel: Merry is the most like me - generally happy and friendly, a bit of an organisator and leader, feels kind of deeply but is still very down-to-earth and also of the scholarly type. Plus, he and Pippin always reminded me of myself and my little sister.
I actually also started thinking that Gimli is also someone slightly like me - I can see myself in the ubiquitous pessimism and the courage that exists side by side with it and in the loyalty to friends, the impatience and the love and awe of beautiful things. Plus, Gimli's jokes generally make me chuckle the most when I'm reading LotR even though they are sometimes really stupid.
And if I was an old man, I'd undoubtedly be a lot like Gandalf.