Whom did Arjuna follow in Mahabharata?

We all know the famous stories of The Mahabharata. We understand who Arjuna was and his purpose (udeshya) & actions (karma) in The Mahabharata. We have been instilled now, and then the Mahabharata hero was Arjuna as he was the most invincible character of the epic. Intelligent, Focused, Skilled, Favorite of Teacher,