Narka was never the strongest kobold, and nor was he ever the largest. For the most part, he is so below average that some would call him a perfect failure. The poor little kobolds' only saving graces would be his quick fingers and his sharp tongue.
Due to Narka's lack of competency in everything he had been assigned to do, he plummeted to the bottom of his dragon/kobold society. A lowly servant, looked down upon by all and treated as if he doesn't exist. It is only when Narka encounters a dragon from outside the city, battered, bruised, and badly injured, do things rapidly begin to change.