Armchair Crusader

Not to be confused with an Armchair Activist or Armchair Warrior, an Armchair Crusader is a person who would essentially die for another person unrelated to their life. Most often found in cult-of-personalities surrounding larger names, these people would blindly talk up about, defend, and proclaim falsehoods of counter-evidence towards a person's character, regardless of the relationship between the person and the crusader.
In essence, they would die for a person who doesn't even know they exist.

Any large YouTuber has a ton of these. Try insulting their character and see how many of them jump to his/her unneeded rescue!
Celebrities have many, or even just famed creators of great works (movies, video games, etc.)

ProclamationPatient said: Jesus Christ, Pewdiepie is the most annoying thing to ever entertain retards.

XxArmchaircrusedzer replied: HOW DARE U TALK ABOUT HIM LIKE THAT UR JUST JELOUS OF HIS FAME AND THAT HE HAS A FAN BASE LOL GO DIE PLZ

ProclamationPatient replied: You're the quintessence of my previous statement.

XxArmchaircrusadzer replied: HAHAHA JUST STOP UR OBV JUST AN HATER WHOES JELOUS OF HIM LOL UR AN IDIOT FOR NOT NOWING HOW TO ENJOY HIS GREAT CONTENT

(XxArmchaircrusadzer is an Armchair Crusader)