“Me!? ... What should I do... Weeell, all right then, I'll go with ya. But if I get in trouble you've gotta help me out. We're not like you. We're not good at fighting yet, y'know.”
—Kliff being recruited
Kliff (クリフ Kurifu, translated Cliff in the fan translations) is from Fire Emblem Gaiden. He is a Villager from Ram Village and joins the liberation army after Alm joins. After the war, he bid farewell to Alm and vanished.
He is depicted as the youngest, smallest, and weakest of Alm's friends when he first joins, which is reflected in his low level and poor stats. However, he actually grows into the most powerful of Alm's three friends as the game progresses.
Talk to him before leaving Ram Village.
Of Alm's 3 Villager friends, Kliff is easily the strongest. Kliff starts out at level 1 with low stats, but will quickly grow past his friends in capability after Promoting. Kliff's growths are very impressive compared to other characters in Gaiden, with only Strength and Luck being average. These growths allow him to excel at any of the classes available to him. On top of having generally good stats, he also comes with the best list of spells among Alm's Villager friends if you choose to make him a Mage. Kliff will almost always wind up as one of your strongest units near the end of the game if you level him.
When the war ended, he bid farewell to Alm. Afterwards, he was never seen again.
—Kliff's death quote