Return List of Database Users and Server Logins
For such purpose i use this login audit script which gives me detailed information of logins and users attached to them along with database and server level permissions. Overall can be helpful to you :

if exists (select * from tempdb.sys.all_objects where name like '%#Login_Audit%') 
drop table #Login_Audit 
create table #Login_Audit 
(A nvarchar (500),B nvarchar (500)default (''),C nvarchar (200)default (''), D nvarchar (200)default ('')) 
go 

insert into #Login_Audit  (A,B,C,D) 
SELECT 
[Security Report] = '-----SQL SERVER SECURITY AUDIT Report-----','-----','-----','-----' 
go   
insert into #Login_Audit  (A,B,C,D) 
SELECT 
[Login count] = 'Total Count of Login','Windows User','SQL server User','Windows Group' 
go    

insert into #Login_Audit  
select a,b,c,d from 
(select count(name)a from sys.syslogins where name not like '%#%') a, -- total count 
(select count (name)b from sys.syslogins where name not like '%#%'and isntuser=1) b, -      -for login is windows user  
(select count (name)c from sys.syslogins where name not like '%#%'and isntname=0) c, -- for login is sql server login  
(select count (name)d from sys.syslogins where name not like '%#%'and isntgroup=1 )d; 
go 

insert into #Login_Audit (A,B,C,D) 
SELECT 
[sysadmin_server role] = '-- SYSADMIN SERVER ROLE ASSIGN TO---',' ----- ',' ----- ',' ----- ' 
go 
insert into #Login_Audit  (A,B,C,D) 
SELECT 
[Sys Admin role] = 'Login name',' Type ',' Login Status ','' 
go 
insert into #Login_Audit (A,B,C) 
SELECT a.name as Logins, a.type_desc, case a.is_disabled  
when 1 then 'Disable' 
when 0 then 'Enable' 
End 
FROM sys.server_principals a  
INNER JOIN sys.server_role_members b ON a.principal_id = b.member_principal_id 
WHERE b.role_principal_id = 3 
ORDER BY a.name 
go 

insert into #Login_Audit  (A,B,C,D) 
SELECT 
[Fixed_server role] = '-- FIXED SERVER ROLE DETAILS --',' ----- ',' ----- ',' ----- ' 
 go 
insert into #Login_Audit  (A,B,C,D) 
SELECT 
[Fixed_server role] = 'ROLE name',' Members ',' Type ','' 
 go 

 insert into #Login_Audit (A,B,C) 
  SELECT c.name as Fixed_roleName, a.name as logins ,a.type_desc  
 FROM sys.server_principals a  
 INNER JOIN sys.server_role_members b ON a.principal_id = b.member_principal_id 
 INNER JOIN sys.server_principals c ON c.principal_id = b.role_principal_id 
--WHERE a.principal_id &gt; 250 
 ORDER BY c.name  
 go 

 insert into #Login_Audit  (A,B,C,D) 
 SELECT 
[Fixed_database_Roles] = '-- FIXED DATABASE ROLES DETAILS --',' ----- ',' ----- ',' ----- ' 
go 
insert into #Login_Audit  (A,B,C,D) 
SELECT 
[Fixed_database_Role] = 'Database Name','Role Name','Member','Type' 
go 
insert into #Login_Audit exec master.dbo.sp_MSforeachdb 'use [?] 
SELECT db_name()as DBNAME, c.name as DB_ROLE ,a.name as Role_Member, a.type_desc 
FROM sys.database_principals a  
INNER JOIN sys.database_role_members b ON a.principal_id = b.member_principal_id 
INNER JOIN sys.database_principals c ON c.principal_id = b.role_principal_id 
WHERE a.name &lt;&gt; ''dbo''and c.is_fixed_role=1 ' 
go 
------------ used is_fixed = 0 for non fixed database roles(need to run on each database) 
 insert into #Login_Audit  (A,B,C,D) 
 SELECT 
 [NON_Fixed_database_Roles] = '-- NON FIXED DATABASE ROLES DETAILS --',' ----- ',' ----- ',' ----- ' 
 go 
 insert into #Login_Audit  (A,B,C,D) 
 SELECT 
 [Non Fixed_database role] = 'Database Name','Role Name','Member ','Type' 
  go 
  insert into #Login_Audit exec master.dbo.sp_MSforeachdb 'use [?] 
  SELECT db_name()as DBNAME, c.name as DB_ROLE ,a.name as Role_Member, a.type_desc 
  FROM sys.database_principals a  
  INNER JOIN sys.database_role_members b ON a.principal_id = b.member_principal_id 
  INNER JOIN sys.database_principals c ON c.principal_id = b.role_principal_id 
  WHERE a.name &lt;&gt; ''dbo''and c.is_fixed_role=0 ' 
  go 

   insert into #Login_Audit  (A,B,C,D) 
   SELECT 
    [Server_Level_Permission] = '-- SERVER LEVEL PERMISSION DETAILS --',' ----- ',' ----- ',' ----- ' 
   go 
   insert into #Login_Audit  (A,B,C,D) 
   SELECT 
   [Server permission] = 'Logins','Permission Type',' Permission_desc ','Status' 
   go 
   insert into #Login_Audit  
   SELECT b.name,a.type,a.permission_name,a.state_desc 
   FROM sys.server_permissions a  
   INNER JOIN sys.server_principals b ON a.grantee_principal_id = b.principal_id 
 --INNER JOIN sys.server_principals b ON b.principal_id = b.role_principal_id 
   WHERE b.name not like '%#%' 
   ORDER BY b.name 
   go 

   insert into #Login_Audit  (A,B,C,D) 
  SELECT 
  [DATABASE_Level_Permission] = '-- DATABASE LEVEL PERMISSION DETAILS ----',' ----- ',' ----- ',' ----- ' 
  go 

  insert into #Login_Audit  (A,B,C,D) 
  SELECT 
  [DB permission] = 'Database Name','Login Name',' Permission ','Status' 
  go 

  insert into #Login_Audit 
  exec master.dbo.sp_MSforeachdb 'use [?] 
  SELECT db_name () as DBNAME,b.name as users,a.permission_name,a.state_desc 
  FROM sys.database_permissions a  
  INNER JOIN sys.database_principals b ON a.grantee_principal_id = b.principal_id 
  where a.class =0 and b.name &lt;&gt; ''dbo'' and b.name &lt;&gt; ''guest''and   b.name not like   ''%#%''' 
  go 

   insert into #Login_Audit  (A,B,C,D) 
  SELECT 
  [Password_ Policy_Details] = '--- PASSWORD POLICY DETAILS ----',' ----- ',' ----- ',' ----- ' 
   go 

   insert into #Login_Audit  (A,B,C,D) 
   SELECT 
   [Policy] = 'Users','type',' Policy status','Password policy status' 
   go 

   insert into #Login_Audit 
   SELECT a.name AS SQL_Server_Login,a.type_desc,  
   CASE b.is_policy_checked  
   WHEN 1 THEN 'Password Policy Applied' 
   ELSE 
   'Password Policy Not Applied' 
   END AS Password_Policy_Status, 
   CASE b.is_expiration_checked  
   WHEN 1 THEN 'Password Expiration Check Applied' 
  ELSE 
 'Password Expiration Check Not Applied' 
 END AS Password_Expiration_Check_Status  
 FROM sys.server_principals a INNER JOIN sys.sql_logins b 
 ON a.principal_id = b.principal_id  
 where a.name not like '%#%' 
 order by a.name 
  go 


  insert into #Login_Audit  (A,B,C,D) 
  SELECT 
  [Orphan_Login_Details] = '--- ORPHAN LOGINS ----',' ----- ',' ----- ',' ----- ' 
  go 

  insert into #Login_Audit  (A,B,C,D) 
  SELECT 
   [orphan logine] = 'Logins Name','ID','','' 
   go 

   insert into #Login_Audit (A,B) exec sp_validatelogins 
   go 

   insert into #Login_Audit  (A,B,C,D) 
   SELECT 
   [Orphan_USERS_Details] = '--- ORPHAN USERS----',' ----- ',' ----- ',' ----- ' 
   go 
   insert into #Login_Audit  (A,B,C,D) 
    SELECT 
    [orphan users] = 'User Name','','  ','' 
    go 
    insert into #Login_Audit (A)  
    select u.name from master..syslogins l right join  
    sysusers u on l.sid = u.sid  
    where l.sid is null and issqlrole &lt;&gt; 1 and isapprole &lt;&gt; 1    
    and (u.name &lt;&gt; 'INFORMATION_SCHEMA' and u.name &lt;&gt; 'guest'   
    and u.name &lt;&gt; 'system_function_schema'and u.name &lt;&gt; 'sys') 

    insert into #Login_Audit  (A,B,C,D) 
    SELECT 
    [Database_Owner_details] = '--- DATABASE OWENER DETAILS----',' ----- ',' ----- ','   ----- ' 
    go   
    insert into #Login_Audit  (A,B,C,D) 
    SELECT 
    [DB owner] = 'Database Name','Owener name','  ','' 
    go 
    insert into #Login_Audit (A,B)    
    select name, SUSER_sNAME (owner_sid) from sys.databases order by name asc  
     go 

    select * from #Login_Audit