#4 He stands for what he believes in
The Leader of Cenation has always been a very outspoken figure in the WWE. He has always spoken his mind when it has come to the treatment of superstars as well as any issues that have been arising in the WWE or the world itself. One example of Cena standing up for what he believes in is when he had refused to compete at Crown Jewel 2018.
This was because of the controversy that was surrounding the Crown Jewel event, due to the unjust killing of Jamal Khashoggi, which was very upsetting for many people around the world. Cena clearly did not like the idea of WWE going ahead with their decision to keep Crown Jewel in Saudi Arabia and boycotted the entire event in the process alongside Daniel Bryan.
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However, this does not suggest that Cena has a problem towards the entire Saudi Arabia country itself. WWE had also held The Greatest Royal Rumble 2018 event in Saudi, and this was before all of the controversies. Cena had labeled it an "honor and privilege" to work in Saudi for the PPV event.
This proves that if Cena doesn't agree with something, he will always do what he feels is right and fair despite the amount of money that is involved, as he clearly does live by his motto of "Hustle, Loyalty, and Respect."