He was the first person to say to Hisoka "I will be responsible for you"
He was the first person to say to Chrollo, "No matter what happens, I'll be with you."
He is the first person to say "you are so cute" to Aizen
He was the first person to say to Yin, "You smile so sweetly"
Who he is is unforgettable for so many people, and what kind of person he is that keeps them grounded.