genuine Christians

What are people's thoughts on some of the hallmarks of true Christians? I think an important one is showing concern for our neighbor, even our enemies. Jesus even prayed for his executioners;'Father forgive them, for they do not know what they are doing'. This is in keeping with Proverbs 25:21;'If your enemy is hungry, give him bread to eat; if he is thirsty, give him water to drink'.