Honesty, loyalty or humor, which do you think is the most important in friendship?

Personally speaking1, I think honesty is the most important in any friendship. First of all, I don't want to be friend with liars2. I won't be able to relax if I know this person always lie to others.  And I can't share my things with she/he because I know my secret won't be safe with he/she.
The second reason is that if I associate with liars, then I will also be construed as one! I don't want to be considered as an liar because if I make a friend who is not honest and alway lies, I will be considered as the same kind of person.

1.  You can also use "in my opinion"

2.  or , "... with a liar"

Don't leave a new line for each sentence.  Only in poems do you do this.  All contractions must have an apostrophe. Don't use he/she, him/her all over the place.  Makes your writing ugly.  You don't have to be so politically correct.  You are not writing a political speech.  Even if you do, you can use plurals.  It makes your speech sounds like it comes from a manual.

http://www.italki.com/knowledge/page/Mechanics%20Of%20The%20English%20Language.htm