I’m honestly torn here as I don’t usually play too many alts; I have 2-3 and a bank character right now in retail; in classic I have a main and a bank alt.
Forever might be the first for me to have multiple alts, especially since the legacy point system rewards it. There are 9 classes, and for each class you will receive 3 leggacy points, one at level 25, another at level 45, and one at level 60.
You can also earn an additional 18 legacy points for leveling the six main tradeskills, one point at reaching 150, another at 225, and at 300 skills in each primary crafting profession.