If I play Reprisal on my personality and he is sent home, does Reprisal still trigger since he isn't defending any more.
Reprisal and Sent Home
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 play Reprisal on my personality and he is sent home, does Reprisal still trigger since he isn't defending any more.
Yes. The "if he was defending" means at any time during the prior attack phase, not the conclusion of it.
On: Reprisal