If I use the Battle ability from Superior Opponent targeting an enemy unit led by a Samurai, am I considered to be targeting that Samurai for the purpose of triggering Know No Fear?
Know No Fear vs Superior Opponent
A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
If I use the Battle ability from Superior Opponent targeting an enemy unit led by a Samurai, am I considered to be targeting that Samurai for the purpose of triggering Know No Fear?
Yes. Per the definition of unit, an action or trait that targets a unit targets its Personality.