Companions are something which is added as a class feature, like the druid can get.
Mounts are subordinate characters associated with a certain hero, and hirelings are much the same (the difference being that the latter are intelligent and paid usually).
Adding it as a mount rather than a separate character is not really mechanically different. I'd say the association of ownership is the only difference as far as 5e is concerned. In pathfinder, things are a bit more complex, because we have some eval scripts which transfer from master to minion.
Last edited by Aaron; March 2nd, 2016 at 08:50 PM.
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