Solf J. Kimblee, also known as the Crimson Alchemist, was previously a state alchemist that fought alongside the military during the Ishvalan Civil War. To gain a victory for the state military, he was given a Philosopher's Stone, which was able to enhance his abilities. The war was quickly won afterwards, though when Kimblee was ordered to give the stone back, he refused, destroying a few of his own allies in order to keep it.
He was imprisoned shortly afterwards, at least until his abilities were needed to aid the Homunculi's plot. He was tasked with locating Scar as well as Doctor Marcoh, and in turn, he would be allowed to ravage certain towns as he pleased.
In the end, after a battle against Alphonse Elric, he was devoured by the first homunculus, Pride.