Neil would have thought about the idea of committing suicide but he would have gone through with it. I feel that Mr. Keating in a way pushed him to telling his father how he felt. Neil was so overwhelmed in that moment he couldn't take it anymore.
Todd was the most courageous of the boys. At first he was afraid of being with all these new people but once he got to know them he felt free to express himself freely.
The coward was the one who told on all the boys. He went toward the easy way out.