This is a list stating what mini’s you need by tier. It assumes you get only different outcomes on the random encounter table.
All tiers: kuwa oni sorceress male kuwa oni [Emissary] qinggong disciple
[1-2] 1 aspis fighter 1 ronin 4 aspis rogues 2 red mantis assassins 4 aspis clerics 3 stirges 3 tengu monks 1 tengu blade 2 spirit oni 1 aspis sorcerer 3 qadiran assassins 1 white eyed clown aspis cleric 1 warrior woman aspis fighter 1 ronin general 1 cruel bandit aspis rogue 1 monkey king aspis sorcerer 2 small fire elementals 1 medium water elemental
[3-4] 4 aspis rogues 2 red mantis assassins 4 aspis fighters 1 ronin 4 aspis clerics 3 stirges 1 iron cobra 4 tengu monks 2 spirit oni 2 tengu blades 1 aspis sorcerer 3 qadiran assassins 1 white eyed clown aspis cleric 1 warrior woman aspis fighter 1 ronin general 1 cruel bandit aspis rogue 1 monkey king aspis sorcerer 2 medium air elementals 1 large fire elemental
[5-6] 4 aspis rogues 2 red mantis assassins 4 aspis fighters 1 ronin 4 aspis clerics 4 iron cobras 3 tengu blades 2 kuwa oni 1 tengu slayer 1 ogre mage 1 aspis sorcerer 3 qadiran assassins 1 white eyed clown aspis cleric 1 warrior woman aspis fighter 1 ronin general 1 cruel bandit aspis rogue 1 monkey king aspis sorcerer 2 large earth elementals 1 huge water elemental
[8-9] 4 aspis rogues 2 red mantis assassins 2 aspis fighter 1 ronin 4 aspis clerics 1 dark naga 4 kuwa oni 2 tengu slayers 2 ogre mages 1 aspis sorcerer 1 white eyed clown aspis cleric 1 warrior woman aspis fighter 1 ronin general 1 cruel bandit aspis rogue 1 monkey king aspis sorcerer 3 huge air elementals 1 greater earth elemental
[10-11] 8 aspis rogues 4 red mantis assassins 4 aspis fighters 2 ronin 4 aspis clerics 2 dark nagas 4 tengu slayers 1 ogre mage 4 kuwa oni 3 ogre mages 1 aspis sorcerer 3 qadiran assassins 1 white eyed clown aspis cleric 1 warrior woman aspis fighter 1 ronin general 1 cruel bandit aspis rogue 1 monkey king aspis sorcerer 3 greater water elementals 1 elder fire elemental