okay so I have been thinking about this for some time and i think i have some ideas:
style:
picture world of warcraft mixed with runescape. I think 3rd person.
races:
humans, dwarves, elves (maybe gnomes or twilight elves).
2 factions would be cool but idk if it will work because if you have lineria vs vez'nan, vez'nan's faction wouldn't have many enemies since all 'bad' creatures are on his side...
classes:
warrior, ranger, mage, artilly.
warrior: till lvl 10 you can choose between 1 handed sowrds, shields, 2 handed swords. at lvl 10 you can choose between: tank (1-handed and shield) dps (2 1-handed weapons) or a healer-dps hybrid (2-handed weapon with some small healing spells)
ranger: till lvl 10 you have a bow and a pet (humans have a dog, elves have a cat, dwarves have a small mountain goat or something and gnomes have a rabbit) then at lvl 10 you can choose between a rogue like sneaky guy (throwing daggers(close range) and melee daggers) a poison ranger (medium ranged, fast shooters, uses pet to keep enemies away from you, uses poison) or a crossbow guy (long ranged, slow shooter, uses pet to keep enemies away from you)
mage: till lvl 10 you have a fire staff or something, at lvl 10 you can choose between a healer (heals people and has some attack if solo, can summon a stone golem) dps (warlock guy, uses lighting and curses to kill people) or a druid guy (uses the forces of nature to kill people, can transform into some animals like a travel form a fighting form and more, healer/dps hyrid)
artillery: till lvl 10 bombs, at lvl 10 you can choose from: ranged (uses muskets, mines and traps to keep enemies at a distance, long range, slow shooter) area damage ( uses big bombs and dynamite, oil with fire and other area things...) dps ( close range, uses taser guns, can hit multiple enemies at ones much like the tesla tower but smaller) all artillery classes can make small robots which explode or just attack.
world:
first kingdom of linerea, future dlc's may add parts of the southern world or even the elven kingdom, or maybe a whole other part of the world we have not seen before.
open world, orc, troll and goblin camps spread around the world.
mounts:
horses and other standard mounts can be bought from lvl 20 or something, flying and water mounts can be bought later, druids don't have to buy mounts because of their travel form.
maybe later on more special mounts like dragons, worgs and dwarven robot mounts.
this is just an idea, let me know what you think of it, thanks for reading