#1 Karl Anderson
Karl Anderson on many an occasion has referred to "The Phenomenal One" as his best friend outside of the ring. The two became close when Styles replaced Finn Balor in the Bullet Club back in Japan. Ever since then, the two have become inseparable and Anderson stated his decision to come to the WWE was heavily influenced by AJ Styles.
Since then, Styles has mentored him and guided his career path in the USA. That’s why he was so incensed that the Club were split up during the 2016 draft. Regardless, they’ve been able to catch up outside of the ring despite not travelling together.
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The two have a bond that can’t be broken. It’ll be the Club against the world for as long they’re both breathing.