This worked most of the time for me, BUT, the interest and favor changes all the time. so I also used http://bdotools.com/ to help me out abit

I also recommend to MUTE SOUND during this amity game.. he is annoying as f***!!!

Amity game:

Success:
Leona
Vitheons Belucci
Samier
St. Pjorn
Margaret






Fail:
Lehard
Bipache
Elgriffin
Balker
Brego

High Potential favor :
Vitheons
Balker
Leona
Samier
Bacho

QUEEK

I'm not sure if something has changed, but Leona's Interest Level is only 6 for Roccio, meaning that all suggestions using her end up failing.

I had success using:

Bacho Ladericcio (Interest 78 / Favor 47 ~ 91)
Vitheons Belucci (Interest 84 / Favor 39 ~ 77)
Samier (Interest 41 / Favor 27 ~ 29)
St. Pjorn (Interest 32 / Favor 36 ~ 42)
Margaret (Interest 35 / Favor 30 ~ 39)

Under ideal conditions, this is the order you want to use for best amity gain with Roccio. It does not fail and gives a lot of amity, while using Leona and Balker Bation CAN give even more amity, the chance to fail those are incredibly higher and not worth it in the long run.

1: Bacho Ladericcio
2: Samier
3: Vitheons Belucci
4: Raibo
5: Rouibo

I recommend you mute the sound if you don't wanna go insane by this npc dialogue.