... it would be easier to answer if we knew who "they" are.
In a Commander game, you are required to have a legendary creature as your commander, which serves as the centerpiece of your deck. This legendary creature dictates your deck's colors and strategy. While your deck can include various other non-legendary cards, the commander itself must always be a legendary creature or a planeswalker that is designated as your commander.
No, you cannot create a token copy of a legendary creature in a game.
Yes, in Magic: The Gathering, you can copy a legendary creature, but if you have two or more of the same legendary creature on the battlefield, you must choose one to keep and put the rest into the graveyard.
Yes, it is permissible to include more than one legendary creature in a deck, but you can only have one of each legendary creature on the battlefield at a time.
Unless you think a ghost is a "legendary creature", there are no legendary creatures which are in the cast list or appear on stage in the play. Legendary creatures are referred to from time to time in the text, as "as was to this Hyperion to a satyr".
Yes, in some card games like Magic: The Gathering, you can create a token copy of a legendary creature and use it in gameplay, but you can only have one copy of that legendary creature on the battlefield at a time.
Zambia!
In Magic: The Gathering, you can copy a legendary creature, but if you have two or more of the same legendary creature on the battlefield, you must choose one to keep and put the rest into the graveyard. This is a rule to prevent players from having multiple copies of the same legendary creature, as they are considered unique.
raquaza
Trying to find if their is a Mythical Creature that is either humanoid or something else that is afraid of flashs of light but is not affected by the sun.
Manticore.
No the crackin is a legendary creature