If the playable character of the most recent game you finished...
... becomes a Champion in LOL. Who is it? What is their hypothetical class/subclass? If you want, you can even create a kit for them. (In the event that there are multiple playable characters, you may choose the one you prefer.)
For me, since I most recently finished Kingdom Hearts 3D: Dream Drop Distance in a replaying session to make sure I'm all caught up for KH3, and there are 2 playable characters, I'll do both.
Sora
Role: Slayer/Skirmisher
Passive: Combo Master Many of Sora's abilities can be reactivated for additional effects. Landing an ability increases the damage of the next use, for a maximum of 3 damage boosts at one time.
Q: Blitz Perform a jumping attack and slam down on the target area. This ability can be reactivated twice in the next 4 seconds to produce the same effect as the first use. Sora becomes untargetable during the leap into the air.
W: Strike Raid Sora throws his weapon, dealing damage and stunning the first enemy champion hit for 0.5 seconds. The weapon passes through minions and monsters, but stops at the first enemy champion struck. Sora can reactivate the ability to call back his weapon before it reaches the end of its throw range, dealing additional damage and stunning an enemy champion for another 0.5 seconds.
E: Sonic Blade Sora rushes in the direction of the cursor, dealing damage and passing through all enemy units. If he strikes an enemy champion, he may re-cast this ability to charge again, for a maximum of 4 times. If he does not hit an enemy champion, he cannot recast this ability.
R: Ars Arcanum After a brief delay, Sora unleashes a blinding Flurry of attacks, driving him forward in the direction of the cursor. As long as he hits one champion with one of the initial slashes, the ability can be reactivated up to five times to tack on 5 additional blows. If Sora misses one of these additional blows, the ult immediately ends.
Riku
Role: Slayer/Assassin
Passive: Dark Form Riku does not use a secondary resource. Instead, as he damages enemies with abilities, he gains 'Dark Points', starting at 10, and the maximum he can gain increases by 5 for every level, capping at 100 at level 18. When he maxes out his 'Dark Points', Riku transforms into "Dark Mode" in which his normal abilities are replaced by a new set of skills, and use of those skills costs the 'Dark Points' that he gained before taking the new form, with repeated use of the same skill increasing the cost each time. When Riku lacks the necessary 'Dark Points' to use an ability, or does not use an ability within a 10 second period after taking the "Dark Mode" form, he reverts back to his normal state and must begin gathering 'Dark Points' again from 0.
Q: Dark Break Riku leaps up and slams on the target area, dealing damage in a shockwave. Enemies hit by the shockwave are slowed. Riku gains 3 DP for every champion he hits with the shockwave, and 0.5 DP for every monster or minion.
"Dark Form" Q: Dark Impulse Riku inflicts a deep gash one one target, dealing damage. Costs 3 Dark Points initially, but each successive use increases the cost by another 3 DP. Riku gains 4 DP for every champion he hits, and 0.75 DP for every monster or minion.
W: Dark Windmill Riku spins his weapon like a windmill, driving himself forward and dealing damage to all units he passes through.
"Dark Form" W: Dark Maelstrom Riku unleashes a powerful spinning attack, with it prioritizing champions as he dashes forward, inflicting damage to any he strikes. Costs 5 Dark Points initially, but each successive use increases the cost by another 5 DP.
E: Dark Fireball Riku fires dark energy in a searing blast, dealing damage to the first unit it hits. Riku gains 5 DP if he hits a champion, and 1 DP if he hits a minion or monster.
"Dark Form" E: Dark Barrage Riku fires multiple blasts of dark energy, prioritizing the first champion in his range. Costs 7 Dark Points initially, but each successive use increases the cost by another 7 DP.
R: Dark Splicer Riku rushes in the target direction, and pummels the first enemy champion he hits with a flurry of blows. Riku gains 2 DP for each attack he inflicts on the target.
"Dark Form" R: Dark Aura Riku gathers dark energy, and rushes all targets in a large circular area around him multiple times dealing damage with each hit, he himself untargetable for the duration. He finishes by plunging his weapon into the ground, releasing columns of energy radically in the circular radius. Costs ALL Dark Points Riku has, with the number of rushes/dashes and columns of energy created, dependent on how much DP he has left at the time of activation.
So there we are! Both of these would probably be considered radically too OP to actually be put in LOL (And there's also the legal issues), but since this is all hypothetical, who says it has to have limitations? Let's see what the community can come up with!