Alfred Pennyworth is the trusted butler to Batman in just about every media form. He is the one person that bruce can go to to confide his feelings.
Alfred has served the Wayne family even before the death of Bruce's Family and helped raise Bruce after their death. He is full of wisdom and guidance even after Bruce has grown up and is one of the few people who know his secret identity.
The trusted butler helps batman when sick, injured and just plain mentally disturbed and therefore has been put in the supporting characters role as well has hero.