Night/day cycle
I don't have any idea for a Night/Day cycle but maybe adding it could give a better atmosphere to the game and make some champ scarier than they should, like Fiddlesticks with his rework, Nocturne, Pyke (his ult) etc.
At the night maybe some champs or entities get buffed or some animals spawn in the jungle, some Void's creatures, maybe like at the night the Gromp (the huge frog) get a mutation and is more huge somethin' like this or wards has less vision and duration. Like i said i don't have many ideas xD so please share some for add a Night/day cycle. If you disagree with it or something in this, just say me and if I didn't forget this discussion maybe i will awnser x)