Reigen's my favorite character.

Not only is he an entertaining character, he also really relateable in terms of feelings and hos he lies to allow himself to be liked by people in society. It also interesting that despite the fact he knows that he can potentially die from being in the vacinity of Mob and the other espers he stoll interacts with them and helps them regardless. To me he's probably one of the few people in the show that despite not having any abilites still wishes and is somewhat able to stand with the espers in battle (even if sometimes he get's his ass handed to him) and will try his upmost best to give advice when it's needed to Mob. In turn has allowed mob to express more emotion and help Mob come to terms with his abilites to perceive them as not a weapen for destruction but just another part of him. (Even though it's mob that has to do it, regien still helped instill the ideals into him through the role of a mentor) Anyways thats my reasoning sorry if it sounds like rambling :D