Taniko is in the second group of slaves owned by the Slave Merchant to be purchased for Naofumi's village. c139
She wasn't part of the group that found and brought back to the village the first monster egg they found together while training as a sort of trophy. She spoke against Naofumi to plead to keep the newly hatched monsters. He hesitatingly agreed to keep it. c143
Taniko appears quite benevolent about dragons when a flying dragon egg was sent to Rock Valley by a mysterious person/group. She mentions a Dragon Emperor that would not allow other dragons to run wild and procreate without regard to their partner. c162