Here is an instruction how you delete system apps and Bloatware in any Android version with TitaniumBackup (TB) and TWRP! 
Like usual, I’m not responsible for any damage of your phone.
I use the Pro Version of TitaniumBackup because you have better capabilities and the following guide is written for all who have the Pro Version:
1. Check if you’re rooted and you have a working TWRP recovery. If not, in the other threads it’s written how you can do this.
2. Install TitaniumBackup from Play Store and the Pro Version of this app.
3. The best way to do a backup in TB is on the external SD card. If you use Lollipop or Marschmallow you have to grant TB the option to use the external SD. The Guide is below.
4. Make a backup of all apps on your phone in TB.
5. Reboot your phone to TWRP and make a complete backup of your phone in TWRP.
6. Reboot to system.
7. Open TB and then delete the apps which you don’t need. Attention: Don’t delete system apps which the phone needs for correct running!
8. Reboot immediately to TWRP. Click mount and then tick system.
9. Reboot to system.
Guide for granting write access in Android 5 or 6:
Cklick on Menu then Preferences and then Backup folder location. A new window will appear where you have to change the backup folder. Click on (click to change). Click on DocumentProvider storage and choose your external SD. Click on << Create a new folder >> and type in the new folder name for your Backup.
That’s it! If I helped you please press Thanks! 