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.
A player, 16 April 2015
Oriole Imperial Vanguard says: "After the first time each phase a Political action targets this Personality, negate its remaining effects"
Test of Sincerity says: Political Open: Target another player's Human Personality. His controller may have him commit seppuku (rehonor, then destroy him). If he chose this, he gains 4 Honor. If he did not choose this, dishonor the Personality, and his controller loses 2 Honor.
Seppuku says: "Rehonor the Personality, then destroy him; these effects cannot be negated"
Scenario is that I target a peep attached with Oriole Imperial Vanguard with a Test of Sincerity. Will Oriole Imperial Vanguard negate "His controller may have him commit seppuku" and forces him to commit seppuku?
Jon Palmer (rules official), 17 April 2015
Oriole Imperial Vanguard says: "After the first time each phase a Political action targets this Personality, negate its remaining effects"
Test of Sincerity says: Political Open: Target another player's Human Personality. His controller may have him commit seppuku (rehonor, then destroy him). If he chose this, he gains 4 Honor. If he did not choose this, dishonor the Personality, and his controller loses 2 Honor.
Seppuku says: "Rehonor the Personality, then destroy him; these effects cannot be negated"
Scenario is that I target a peep attached with Oriole Imperial Vanguard with a Test of Sincerity. Will Oriole Imperial Vanguard negate "His controller may have him commit seppuku" and forces him to commit seppuku?
"may have him" is not an effect to be negated, so he will not be "forced" to commit seppuku.
Since making a choice is not an effect, the Personality's controller still must choose whether to commit seppuku or not. If he chooses seppuku, it will not be negated, the Personality will be destroyed, and the 4 honor gain will be negated. If he chooses not to seppuku, the Personality will not be dishonored, and the two honor loss will be negated.