RedFox
First Post
Living constructs and intelligent undead, depending on how much you can stand the smell.
After that, any race with A: long life, B: a more lawful bent, C: low Wis or naturally low Will saves, D: High stats other than Wis, depending on the purpose of the slaves (basic laborers need high Str and Con, artisans need high Dex, while courtesans need Cha, etc.) and E: no natural resistance to authority (see: B.) or mind control.
Specialized extraordinary, supernatural, or spell-like abilities are a big bonus, of course.
After that, any race with A: long life, B: a more lawful bent, C: low Wis or naturally low Will saves, D: High stats other than Wis, depending on the purpose of the slaves (basic laborers need high Str and Con, artisans need high Dex, while courtesans need Cha, etc.) and E: no natural resistance to authority (see: B.) or mind control.
Specialized extraordinary, supernatural, or spell-like abilities are a big bonus, of course.