Good Natured

Good Natured is a Fallout, Fallout 2, Fallout Tactics, Fallout: New Vegas, and Lionheart trait.

You studied less-combative skills as you were growing up. Your combat skills start at a lower level, but other skills are substantially improved.

Fallout 1, Fallout 2, Fallout Tactics
First aid, doctor, speech, and barter get a +15% bonus. You get a -10% modifier to starting combat skills (small guns, big guns, energy weapons, unarmed, melee weapons, and throwing). This is a one-time bonus only.

This trait is useful, as it is unlikely for even a combat-oriented character to use more than 3 of these skills, and in all likelihood only 2. As such, 20% is "lost" while at least 45% (speech, barter, and doctor) is gained. In Fallout 2, first aid is mostly useless as one can wait indefinitely. This is not the case in fallout 1, and so in fallout 1 all 60% of this is useful.

Lionheart
Your combat skills start at a lower level, but barter and healing rates are substantially improved. Barter gets a 25 point bonus. You also get a negative 5 point modifier to starting melee combat skills (one-handed, two-handed, and unarmed). This trait cannot be selected with Nasty Disposition.

J.E. Sawyer's Fallout RPG

 * You're a friendly person and are hesitant to employ violence to solve problems. You have +2 to medic, persuasion, and science. However, your combat sequence is -4.

Fallout: New Vegas
This trait in New Vegas will boost your social skills, while lowering you weapons skill. This trait is preferred for a pacifistic player.