Kingdom Hearts OC 3: Hiroto

"I know, I am a guardian of light ... and that my duty is to protect Hikari and all of our worlds..., but ain't I  even more his best friend? Isn't it even more my duty to be at his side and support him? I can't let him down... I'm sorry, please forgive me."

In the upper right corner you can see, how he looks like in KINGDOM HEARTS 1 and KINGDOM HEARTS: Chain of Memories.
The one on the left is him in Kingdom Hearts 2 and the last one is from Kingdom Hearts 3Ds.

He is a protector next to being a guardian of light - AND of Hikari. He is very loyal and supportive, kind of the big brother of that group. Also he is the best friend of Kenji.
When Kenji disappeared and turned to darkness, he left the group and his duty of being a guardian to get his best friend back.

In Kingdom Hearts 3Ds (Dream Drop Distance) he participates in the Mark of Mastery exam for the sake of his friends. His favourite Dream Eaters are Kooma Panda and Meow Wow.
After the exam he and the other guardians have gained new power and weapons. Now they have to face the dangers ahead.