We neither need wings or mounts; the in game dynamics account for both of these already (sprint, gliding).
Housing is pointless unless it's guild housing, that would be great (a mix between arche age and GW2's versions).
Pets would be a fantastic idea; something very similar to Aion would be ideal. From alert pets when in open world PvP, to loot, carry, and vanity pets. Aion also have pets where if you feed them they'll produce items for you e.g. healing pots, gems, even xp boosts similar to hongmoon soups. I think of the four options, pets stand out as being both pract