My favorite key board is all the letters.

Mine is the a key it awesome. With out it this sentence would sound like this: Mine is the key it wesome.

Personally, my favorite key is the "enter" key... when you press it, you begin a new line. You continue your story, your speech, whatever it may be; sharing your own thoughts, or maybe just hanging onto them within the databases of a computer, so that you don't lose them.
Some people would argue that the enter key is not important, that it isn't necessary to write. And you know what? That's absolutely correct. You don't really need it. But how many things might we not need, that we have anyways? This key may not be particularly useful; however, it can organize, it can be used to start a new idea. I actually use it a lot.
Sorry. I take some things way too seriously. Like enter keys. ;)

I like the backspace key. I make a lot of mistakes. My life is a mistake.

My favourite key is A.

Mine's the Enter key, when I press it magic things will happen.

My favorite key is the space bar, because I furiously hit it, and it makes a relaxing sound

My favorite key is S.

I like the "E" key because it is the most used letter in English.

Space bar, g and h are my favorite keys. Space bar is awesome. I frequently use it.

My favorite keys are "k" and "i". I use qwerty and I touch type, so you can probably guess why I like those keys. I also like ".", because I like the twisting motion of my right hand when I press that key. I don't know why.

As for the keys I hate, I hate the backspace key and the '; keys, because they tire my pinky out.

I hate all keys that require me to stretch

Same as mine. I think that is the letter I use the least but like the most.

My favorite key is probably the "~" key, because of its mathematical implications. For instance, if you were to log on to desmos.com and create a new graph, you could use the "~" key to make a great equation for finding a line of best fit. All you have to do is create a table, plot some points (preferably close together), and press my other favorite key, enter. Then type in the equation y1~mx1+b. This will give you what r is equal to, as well the values required for a line of best fit. Of course, you could never do this without the "~" key, making it my favorite key on the standard QWERTY keyboard.