Thanks everyone for the replies! I've only had him for 2 months now, but I've known him for about 5 months. He used to lick me all the time but I gave him a salt block so he doesn't do it that often anymore. I let him play with his lips on me and he's never offered to bite me. If he does bite me, my fault. I've seen him charge 2 times now, and each time he stops when he realizes the person isn't moving. From what I've heard, he's never broken skin with a bite and he's never trampled anyone. He bit the previous owners son on the arm and he had a red mark for a day. Usually he'll just grab to see your reaction. He is a 10 year old gelding, not girthy, never stalled, a dream under saddle. Although I've heard, but never seen or experienced him bolting or running through the bit on trails. I've had my 13 yo sister on him for a trail and he was perfect.
For the two months I've owned him, he's charged once and bitten maybe 3 times. He charged the gate when I had a friend feed him for 2 days. She was taking a long time with the food and he got annoyed I guess. I wasn't there though. The bites were all pretty harmless. He got my boyfriend twice and they were when jason tried to reach over the fence to pet him. The other time was when my friend tried haltering him. (She claims he bit her, but he always helps me and anyone else put his halter on so I'm not sure on that one.)
To palomine, I honestly don't think he'd charge a small child going into pasture. He has pasture mates that are boarded and he doesn't care in the slightest if the pasture mates owners go and grab their horse. But I appreciate the reply!
To rascalboy, I think I answered most the questions, but a shock collar for a horse, I've never even heard of it! Lol! But if he gets worse I'll be considering that big time! :P
To LetAGrlShowU, I liked this advice a lot, I know my plans for the week now! Lol! But definitely trying this. If nothing else works, I'll try to find a trainer experienced in this kind of thing. I just think he's to good of a horse to just give up on.
Since I posted the original question, he has not shown any sign of aggression. Only thing that's not improving is his attitude when your not riding. If your doing anything on the ground with him he has his ears back, not really pinned but not happy or relaxed either. But I've noticed if you itch his belly or butt cheeks before you do anything with him, just love on him some, he seems to be more relaxed. But the second you get on and take him somewhere he's ready and happy to go. He loveeessss trails. I try to take him on trails as often as I can, which is about 3-5 days a week. Thanks again to all the replies! I appreciate it!