Daiki was a happy boy, he was lively and usually the life of the party. He tended to befriend everyone he met regardless of who they were, having somewhat uncanny social skills.
He had many friends, actually he was friends with everyone he knew, be it some silly wannabe mafia boss or the local boy who was always at the park due to being neglected by his parents. As for his personality?
He's no recluse, unlike his twin brother Kenji, enjoying the company of ALMOST everybody. It's rare for him not to like someone since he platonically loved almost everyone he met. He's a definite introvert, happy, bubbly and very friendly.
He was a happy, silly boy, even if he didn't seem like it due to his somewhat edgy and punkish or maybe even emo, steampunk clothing. WHO CAN TELL AT THIS POINT?