User blog comment:FrostyFire/The 190th Hunger Games/@comment-24692847-20140710181326/@comment-5824375-20140710235658

Lionel is right-handed, his right hand also being his strongest as well. His left hand is more accurate however, so in case he ever wants to throw a knife, he will likely use his left. His right hand is his sword hand.

Pompey, however, is ambidextrous. It's a talent he developed due to constantly working, but majority of the time, he uses his right hand.