Edward is a sparrow: small, but agile and strategic, able to fight off much bigger animals like crows.
Alphonse is a turtle: Tough, able to live for a long time, but cannot survive without his shell.
Winry is a monkey: grease jokes aside, she is able to improvise and use her tools to fix things.
Roy is a wolf: while he can be tamed, he'll do what he can to protect his pack.
Risa is a dog: Loyal, she follows her master's orders, even saving his life, and expects no reward.
Hughes is a cat: Proud of himself and his achievements, he pounces and attacks out of nowhere.
Nina is a lamb: Pure and innocent, she was sacrificed for a "greater good"
Tucker was a shark: a certain breed will eat its own siblings in the womb to be the one who survives.
Armstrong is a gorilla: he's proud of his silverback, and strong.
Any more I should do?