There is a site called Robot Hugs. It is a webcomic that is updated 2x a week and it has some really cool stuff!
There are two comics that I find particularly great though in relation to mental health.
This first one is my favorite! I wish I had someone like this in my life.
This second comic describes perfectly how annoying it is when people stigmatize depression and say that “our lives are good, why should we be sad.” I get so tired of people thinking that I have nothing to be sad about. Depression is a chemical imbalance!
Living, Breathing, and Surviving, and Coping with Mental Illness 