A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from the Wayback Machine (its copy), so posts 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.
1. When Yojireru enters play, may I use his trait to target a personality in my opponent's discard pile with no abilities, for the sole purpose of removing the personality from the game?
2. When Yojireru enters play and my opponent has a Kakita Osei in his discard pile, can I copy Osei's "get a holding and reduce its cost by 2" ability and then immediately use it?
When Yojireru enters play, may I use his trait to target a personality in my opponent's discard pile with no abilities, for the sole purpose of removing the personality from the game?
Yes.
When Yojireru enters play and my opponent has a Kakita Osei in his discard pile, can I copy Osei's "get a holding and reduce its cost by 2" ability and then immediately use it?
Yes. Precedent: Reactions triggered by entering play on the Egg of P'an Ku.