Courage
The state or quality of mind or spirit that enables one to face danger, fear, or vicissitudes with self-possession, confidence, and resolution
http://www.scientificsportssolutions.com/sports%20images/courage%20fireman.jpg

Aggressive
Inclined to behave in an actively hostile fashion
http://pawsitivelypitbull.com/images_aggression/aggressive%20dog.jpg

Knowledgeable
possessing or showing knowledge or intelligence
http://www.olap4all.com/O4/var/plain/storage/images/media/images/knowledge/481-1-eng-GB/knowledge_medium.jpg