I mainly love him for his quotes. He's also awesome and badass in general. Some of Kamachi's afterwords explain it well, too.
Some of my favorite quotes from him:
"Though I can't remember the events from before, even so it is because of them I'm able to stand here. The 'me' from the past still motivates the 'me' that can't remember anything today. What he left behind isn't in the 'head', but in the 'heart'. So, it doesn't matter if I can't remember, I still understand what I need to do (...) Kamijou Touma isn't the kind of person that lets something small like losing a bit of memories stop him."
“…I don’t have any major reason. If I can avoid it, I’d rather not go anywhere dangerous. If it’s something I can just abandon, I’d go ahead and abandon it. If everyone wrapped up in this coup d’etat were the enemy characters in a shooting game that existed solely to be shot, then I’d have already abandoned all this and been trying to find a way back to Academy City.” --- “But they aren’t. That kind of convenient person doesn’t exist. Everyone carries something important enough to die for and they are running around so as not to lose it. So how am I supposed to abandon this? This isn’t an issue of duty or important-sounding reasons. If you want to stand up and fight, I say you should stand up and fight.”
"Does a Level 0 like me really seem that incredible? Hero? Villain? Stop kidding around! Can't you save someone if you're not standing at that spot?! In front of your eyes are people that don't wish to cry that are crying! In front of your eyes are people that can only clench their teeth while struggling and can’t even say the words 'please save me'! Is that not enough? Just step up already! You don’t need special positions or reasons!! With these, you can step up and be a shield for them!"
"I don’t know what you’re trying to protect, nor do I know what you have been hurt by. But, if you want to protect that child then do so with your chest held high! Here and now, be proud in knowing that you are protecting her! This is your life right? Then decide for yourself! If you want to protect everything with your hands then do so, if you want to abandon everything then do so. But, what do you yourself want to do right now? Can you really be satisfied giving someone else that you don’t really understand your most important thing?"
"All the people who live on this Earth aren't so over-the-top. If you look at this planet from a satellite or something, you probably won't think they're anything but ants. But I saved them. It doesn't matter how tiny they are— I've seen with my own eyes, the instant someone's 'world' was saved."
"Someone who thinks he'll 'save this world' won't be able to protect it. Our world isn't so weak that we need a bastard like that to save it."
it's mostly his personality that i like, the fact that he will go out of his way to protect someone who needs him regardless of who that person is even if it is an enemy.
