Who Am I Riddles And Answers

I have a eye but still cannot see.

Who am i ?

I am a curved, sometimes I am straight. I come in different shapes and sizes. You can fit me anywhere, but in the end, there is only one right place for me.

What am I ?

Its a protector.
It sit on a bridge.
One individual can see directly through it , while others wonder what it hide.

Who am i talking about ?

What am I?

They Fight against the vampires.
They know their spell.
They fight against demons.
They are the most famous ghost hunters
They always do together as they are brothers.

Who are they?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

Ponder upon a creature who exists in disguise
Who deals in mysteries and has nothing to tell you except lies
Now think about what is constantly the final thing to mend
What is the middle of the middle and the end of the end?
Now ponder upon the sound you must have often heard
When you were looking for the hard-to-find word
If you can tie them all together and answer this
Tell me what living creature you will always loath to kiss?

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I ?

I have 13 hearts, yet never alive. Who am I?

I am quite hot but become too cold if you remove first two letter. What am I ?