Downworlders

Downworlders Are:

• Downworlders are hybrid creatures, or people other than the Nephilim with different supernatural abilities. Said to be; Half Human and Half Demon.

Downworlders consist of the Fair Folk (Faeries), Children of the Night (Vampires), Children of the Moon (Werewolves), the Children of Lilith (Warlocks), etc.

• Downworlders cannot bare the marks of the Shadowhunters. The only rune they can bare is the Alliance rune created by Clary Fray, that allows Downworlders and Nephilim to share abilities.

Runes

Runes:

• Runes or Marks are angelic symbols that the Nephilim burn into their skin, using steles, to give them various "supernatural" abilities. 

Runes are the Nephilim or Shadowhunters most used tool to help fight demons. Runes are a complex array of symbols and language given to Shadowhunters by the angel Raziel, that give Nephilim a power mundanes can not bare.

• They were given to the first generation of Shadowhunters by Angel Raziel so that they could fight off demons. Every rune accessed by a Shadowhunter is written in the Gray Book.

Most runes are temporary and fade off, leaving a thin white scar in its place. Other runes are permanent and stay on forever. 

• If a rune written in the Gray Book is burned into a mundane, it can drive them insane and turn them into Forsaken.

The closer the rune is to the heart the more effective the rune's power or ability is. Most runes can be placed on other objects like rocks or bricks.

Shadowhunters

Shadowhunters Protect:

• They protect the world from being overrun by demons and protect mundanes from evil. Keep Downworlders in check and make sure that Shadowhunters themselves and Downworlders are fair to each other. They also make sure that there are no disruptions in the Shadowhunter world.

Shadowhunters Are:

• Half Angel and Half Human. 

They are like the reinforcement relating to the Downworlders and use holy weapons to kill demons.

The Clave

The Clave:

• Government > Circle

The Clave make the laws that Shadowhunters and Downworlders have to abide by. The Clave is the government of Shadowhunters and Downworlders, they inforce the laws so that Shadowhunters and Downworlders get along. 

• Only Shadowhunter adults go on the Clave. Up until City of Glass when Downworlder leaders are given seats in the Clave.

The Mortal Instruments

There are 3 Mortal Instruments:

• The Mirror
• The Mortal Cup
• The Sword

These 3 items are used to protect and create Shadowhunters, and find the truth in them.

If in possesion of all 3 Mortal Instruments, you have the power to summon Angel Raziel.

Luke Garroway

Luke Garroway is a trusted friend of Jocelyn Fray, Clary's mother.He also likes Jocelyn as more than a friend, but that love is not returned. Before Luke was bitten by a werewolf he was a Shadowhunter in Valentine's circle and also Valentine's best friend. When Luke was bitten Valentine disowned him and asked Luke to kill himself. Luke didn't which infuriated Valentine, especially when Jocelyn left Valentine. Luke is Clary's father figure in the book series and gets very involved in Clary's Shadowhunter life. Luke is also head of a werewolf pack in New York. While Clary's mom is in a coma, Luke looks after Clary. Another name Luke goes by is Lucian Graymark. 

Max Lightwood

Max is the adopted younger brother of Jace. He is also the younger brother of Isabelle and Alec. Being as young as he is, Max is often ignored and not invited into "adult" conversations. Max isn't really introduced into the series until the end of City of Bones. Max has a huge thing for comic books and thinks of Clary as a sister. Clary always gives him comic books and sometimes reads with him. In City of Glass something terrible happens to Max that stops him from being in the rest of the series.