tst> create user u3 identified by u3;

User created.

tst> grant create session, create role, alter user  to u3;

Grant succeeded.

tst> connect u3/u3@tst
Connected.
tst> create role u3_role;

Role created.

tst> alter user u3 default role u3_role;

User altered.

tst> create role u3_role_1;

Role created.

tst> select * from user_role_privs;

USERNAME                       GRANTED_ROLE                   ADM DEF OS_
------------------------------ ------------------------------ --- --- ---
PUBLIC                         PLUSTRACE                      NO  YES NO
U3                             U3_ROLE                        YES YES NO
U3                             U3_ROLE_1                      YES NO  NO

tst>