User blog comment:ACWeapons/RWBY Pairings - Possible Children Ideas/@comment-27888871-20160505024422/@comment-26397825-20160505030044

Human + Faunus = Either Human or Faunus

Faunus + Faunus = Random Faunus, but I believe it's not so much 'entirely random from any animal' as 'can take after either parent at random'.