Inigo from Awakening (This is going to be long)
(To give some backstory I paired up Libra and Olivia together)
I first saw him flirting with a girl in the chapter he was first shown, which I was not very happy about.
However as time went on I saw more than just that flirtatious attitude, I saw his funny and emotional side (Gerome and Inigo support)
I started to like him more, but then I saw his supports with his father making him out to be a deeper character.
I also read some of his other rather serious quotes and dialogue such as Death's Embrace and Future Past 2.
Future Past 2 showed him at his best as a person who always smiles to make people feel happy around him.
Here's my favorite quotes “I wish I could be shocked at this, but the dead rose all the time in my future. Friends, neighbors - they all became Risen... And then they had to be taken down. I've done this so many times now, I barely feel anything at all...”
"Sorry... I don't think I can go on... Everyone...promise you'll keep...smiling..."
"You may think me a dandy and a fool, but a lot of people depended on me in the future. Every day, I was out there fighting Risen and risking my life. With everyone looking to me to be strong, I had no choice. I HAD to be invincible. I couldn't complain or show any weakness. Not with everyone else struggling in that damn war-torn wasteland... Even with you and Mother gone, I had to pretend I was fine. That I wasn't hurting. I had to fight every day of my sorry life and wear a smile while I did it!"
This was so moving to me that I started to follow Inigo's philosophy of always smiling to make everyone happy.
Inigo is now my favorite character in all of fictional media.