Exo Champion
This is a champ i thought up a while back and i went back and tried to add in some of the information people said was missing from my idea. Now that being said this is the first time i have put numbers into this so if something seems too high or low please let me know so i can fix it. (if you think something is too high or low please provide me with some options you think are more reasonable as i do not know how the numbers actually correspond to the game i just looked at a few other champions and tried to make a reasonable estimate of what sounds good.)
Exo would be a support and tank based character.
I only see him being a bot lane support character
I won't provide a full build for Exo because I don’t want to tell anyone what items they should play with him I want people to figure it out on their own and experiment. But if I had to choose a couple I would choose
and 
skills: Auto Attack: Exo launches a small tightly packed group of Nano’s at the enemy within (525) units Passive: Analyze and Communicate- Exo takes notice of any nearby enemy champions that have a negative status effect (stun, slow, etc.) and communicates this to nearby ally champions, within a certain range, thus raising the amount of damage they do to that enemy. Range: 525 increased amount: 2% Q: Exo sends some of his Nano's to assist an ally Champion healing them by (150/200/250/300/350) amount over (3.5) seconds. Quickly sealing their wounds and making them battle ready again. Range: 575. Cooldown: 7.5 seconds W: Exo launches a bomb made up of Nano's that latch onto a single target. Upon exploding the Nano's making up the bomb attack the targets CNS (central nervous system) and stunning them for a short time and leaving the target in a weakened state for a short time. Damage: (150/225/300/375/450) Stun time: (.75/1/1.25/1.5/1.5) weakened state lowers defenses by 5% for 3 seconds. Range: 525. Cooldown: 5 seconds E: Exo summons a cloud of Nano's to act as a shield for a single ally champion for (3.5) seconds or (175/250/325/400/475) amount of damage, whichever comes first. Range: 550. Cooldown: 6 seconds R: Exo charges up for a short time (2 seconds) then releases Nano's over the entire map. the Nano's go into over drive and increase all stats of all ally champions by a certain percentage (2%/3.5%/5%) for 10 seconds. Range: whole map. Cooldown: (45/55/65)
Lore: Exo was originally made as part of a healing process for the members of the League of Legends. Due to the immense amount of fighting that goes on there, there are always at least a few champions that need stitching. So the medical staff came together and developed a process that would allow Nano-bots to go in and replicate the cells of the wounded champs and help them make a speedy recovery. These Nano’s had the ability to communicate telepathically so that they were always working as an efficient team. The medical staff kept small portions of these Nano’s in small bottles and had the intention of selling them on the battlefield, but when a nurse accidentally fell into a pallet of the bottles the Nano’s broke free, and came alive. Confused at first then they put their collective minds into one objective… staying alive in their new hostile environment. They came together as one and learned how to replicate each other instead of other champions, but kept the process in their memory banks in case it was needed in the future. They decided to make themselves one and call itself Exo. Exo then decided that it would join the League of Legends and prove itself as the worthiest champion.