User blog comment:Skeith9/Heroic Spirits Speculation/@comment-4133073-20150625224618

Simo Haya is actually Simo Häyhä / Simo Hayha. ...Anyhow, if this guy is included, I think Ilmari Juutilainen should be a Servant, too. XD

Ilmari Juutilainen was the flying ace of the Finnish Air Force during WWII - he's the top-scoring non-German fighter pilot of all time, outdoing all Japanese, Soviet, UK and US pilots. He shot down at least 94 confirmed planes. ...I suppose he'd be Rider class? idk