Ideas for a League of Legends MMO if you were to ever come out with one. Please notice me :(
Now take note, these aren't all everything that would go in the game, just recommendations that could be cool, or cool if tweaked. I did not make this list with intentions of everything being in the game (If there will be a game one day). Thank you for reading!
-You could choose from the humanoid races, and any faction.
-Certain factions would be at war with each other, for example: Demacia and Noxus, or maybe Shurima pissed off Ionia. The wars could rotate around as players made it be. Like so many players could do raids against a factions enough that the 2 factions begun war with each other.
-For certain races like Darkin, or Ascended, etc. You could work your way to it if need be, instead of starting like it. Take Kayn for example. You find a Darkin weapon, and have to do certain quests or minigames to choose if you become a [Shadow Assassin in his case] or Darkin.
-If you were to be from the shadow isles, you would be like Kalista how shes still humanoid, but you could become evolved and be like Hecarim and grow some horse legs or wings, etc.
-You could be an outcast, and lose all your trust in one faction, but earn more in another, so you wouldn't be stuck to one faction.
-PvP could be 1v1s and Wars. (Or as a side note you could put LoL maps in and make it a Summoner's Rift/Twisted Treeline/Howling Abyss MOBA to live LoL in an MMO)
-Mounts. You could find wild animals and tame them, while some being able to ride if they're big enough. (Skarrl, Giant Poro, Bears, Boars, etc.)
-Skill system similar to Elder Scrolls, how you don't pick a class, but you can level up skills, but you can only choose [X] skill trees at a time (For example, you could work on One-Handed weapons, Heavy Armor, and Dexterity at once)
-Fast travel. You could pay for a ride on a carriage, or ride on a Piltover flying-ship, etc.
-There could be transformations for certain players. For example, a Yordle could have a Gnar transformation, with one form being tiny and mobile, but the other be Large and Beefy. Or a Human could have a berserk type transformation. Or even be a shapeshifter.
-Shipbuilding, for the plentiful oceans.
-Random world events and bosses. You could be walking in the area in between Demacia and Noxus for example and a Crag Beast invades a small village. You can save the village for XP and loot. Or you could be on a ship to Ionia, and a Kraken could attack.
-Dungeons. Self explanatory
-Items in the game could be legendary gear. For example, Bloodthirster could be a legendary 2 handed sword, with shielding and lifesteal enchants. Warmogs, a chestplate with very high HP regen enchants. etc.
-Champions in the game could be your mentor/give you quests. You could earn gear, or learn abilities from them.
-Fighting style like GW2 (?) I feel like that is the best MMO style. Not Action-RPG, but not completely WOW style either. A nice in-between.
-Professions such as cooking, Armorsmithing, Weaponsmithing. You know the drill on that one.
-Day-to-Night cycle (with moon cycle) to really make you feel like you're in the game. You could carry lanterns at night to be able to see in the pitch black when the moon isn't out, or it being lit enough with a full moon. (Also could do a Blood Moon event). And your character has to sleep or you'll get exhausted ;) Make certain creatures and troubles more active at night so it reaally makes you dread nighttime.
-Player market. Maybe you made a nice weapon you want to sell, or you caught some rare fish? Or maybe you have a nice hunk of dragon meat to sell.
-Roaming champions such as Yasuo and Riven could be found in the wild, but never in the same spot, so you really have to look for them if you want their mentorship. But if you become their mentor, you always have an icon on the map of them.
-Make lots of character customization. Hair length, colors, scars, height, build, armor, armor colors, accessories, many more. There could be perks to character builds. Maybe a very beefy person would have a higher base strength, but less mobility, but a shorter and skinnier person vice-versa.
-Unique legendary items. You don't want to see everyone with the same sword/gun/bow running around. Let everyone feel a bit more unique with transmogs or weapon customization. Maybe they want to tie a ribbon on the hilt of their sword?
-Hair and Beard growth system maybe?
-Armor dyes? Idk