Dr. Stylish was a member of the Jaegers, and formerly was a Doctor in the service of the Empire.

He was obsessed with being Stylish and looking good. He is however at heart a classic mad scientist caring nothing for the lives of his subjects and more concerned for his own experiments than anything else. He was however very intelligent being able to see through Tatsumi's cover even when Esdeath could not. He has also been heavily hinted to be homosexual.

(Source: Akame ga Kill! Wiki)