Patience

I don't mean to be that guy.But you know what they say patience is a virtue.I truly believe that too.Patience is something that you have work towards.Its takes self control to be patient and depending on the situation it could take alot of self-control.
For example you could be training someone to do a job. They may mess up alot and you may be frustrated with them.An impatient person may just fire them and hire a new person.While a patient one might  take the time to train them because they believe the person could do it.

Humility

Should a Leader be hunble?Or should they be prideful?There are ups and downs to both,but I believe most people would prefer a humble one.
Here's why.No one likes someone who's is full of themselves.Whether they are bragging or just showing off because they can.Praise is good thing,but when all you do is use it to feed your ego it becomes bad. If I did when I talked to you was boast and say I'm better than you would enjoy talking and working with me. Probably not.
On the other hand, if I was humble and actually genuinely wanted to talk and work with you.You might find me pleasant to be around.
I'm not trying to say that pride is a bad thing.You should stand up for what you believe,but if you're just putting people down then there's a problem.

Attitude

What is the right attitude? Really depends on the situation and your mood doesn't it. At a funeral your attitude may be different  then at a party.But I don't know you personally.What I do know is what kind of attitude I want a leader.They should have an open mind and always be open to suggestions/try ready to try new ideas.Some enthusiasm would be nice, because working with someone who's upbeat is much more encouraging then someone who doesn't seem interested.
Leaders should  be positive and friendly.This helps build stronger ties with the people working together.The people who work with leaders should also recipitate the attitude to help build a healthy work environment.

Gratitude

Gratitude.Why should a leader show it?Let me rephrase the question for you.How would you like it if you worked hard on a project/job for someone and they brushed it off like it was nothing.I would imagine you wouldn't be too happy and probably wouldn't try as hard the next time.The reason a leader should show gratitude is that it lets the people being led know that they are appreciated for all the hard work and time they dedicate to the project/job or whatever is being done.
As a leader having reliable people to work with is wonderful,so treat them as you would want to be treated.No one likes being mistreated.