AbdulAlhazred
Legend
Yes. As long as they are idealists likely to get themselves killed in defence of their allies... (If they don't want to do this or use divine challenges they don't become paladins, so Chaotic Evil ones are rare).
There ARE 'Blackguards' which appear in Heroes of Shadow. They are not necessarily evil, but they are paladins built around VICES instead of virtues, so they typically are at least anti-heroes if not actual villains.