Greetings!
There are two methods of creating local usernames and passwords on the ArubaOS-Switch platform.
The first is the 'password <manager | operator>' command, which (as noted) is limited to two accounts, which can be renamed.
The second is to use the 'aaa authentication local-user' command, which utilizes role-based access control (RBAC) to assign users to specific, customizable groups with different levels of management access. We are checking with the engineering team to find out the maximum number of users this feature supports, but tests in our lab show that we support more than 64 local users.