Raphael
Throwing knives / throwing cards
Alec
Bow and arrow
Jace
Regular seraph blade
Meliorn
Katana
Isabelle
Crossbow
Maia
Your fangs, but you also keep a little hunter's knife in your boot or jacket
Magnus
Glittery pocket knife (that Magnus gave to you)
Will
Whip
Jem
Seraph Blade
Jordan
Dagger
Tessa
Your warlock powers are enough