World of Warcraft: Forever
WoW Forever rulesets: stay with your friends
Friends need the same ruleset and faction to group, join guilds, run dungeons or raid together. A realmless structure does not remove those boundaries. Choose together before creating characters.
Choose the same community
Normal, PvP, Roleplay and Roleplay-PvP are available at launch. Hardcore is planned for later. Normal allows discretionary PvP; PvP exposes you to opposing players across much of the world. Roleplay adds naming and behaviour conventions.
Fix a ruleset mismatch
You cannot freely switch rulesets: create a character under the desired ruleset instead. Battlegrounds may mix rulesets, except Hardcore, but that is not cross-ruleset dungeon grouping. Blizzard describes a future transfer for dead Hardcore characters; do not mistake it for a current general transfer option.
Sources: [2]
Check faction and language
PvP restricts you to a single faction and may temporarily limit faction creation for balance. Preferred Online Language is under Escape > Options > System > Languages and Social. It applies account-wide and has a 24-hour change cooldown; matching language does not override faction or ruleset restrictions.
Sources: [2]