So today I'm publishing this just to show you which companion can be promoted (but for some of the companions I am not sure).I'm also gonna tell you what can they be promoted into

• Here is the list 
• Bonnie Anne - Can be promoted for only 2 times. Fox Musketeer into Fox Sharpshooter into Fox Sniper
• Rat Beard - Can be promoted only 1 time.Rat Officer into Rat Commander