User blog comment:Leolab/Juuni Taisen Special: 12-Way Battle Royale/@comment-379205-20171214021333/@comment-422690-20171214033549

One thing to note about Diarmuid's love spot - the only ones it would make a difference for are Ayaka and Panne, and Ayaka is moderately questionable considering her absolute devotion to Kyoichi and placing her love for him above everything. Morrigan and Angela would have no issues combating or even killing him despite - or perhaps even because of - their induced feelings. Parcel, being 10-12 at the very most and a Contractor on top of that, is actually incapable of that sort of emotion (indeed, she's the only female in the entire Darker than Black series immune to Hei's harem powers).

Basically, due to the personalities of the various females he's opposed to, his love spot will fail, or worse backfire.