With my first charrie Sapphire it was a learning curve considering i have a wild imagination and i just let my fingers type and i realise i have a charrie.
Sapphire was a decendent of Voldemort and could speak parceltounge when she was angry, she was a rather a firiary charrie i let her flow from my imagination, she was controlled by her father and it affected her personality i sadly let her go after her second term as i felt i had played her out but as i say learning curve.
Now with Ruby it was different she was planned with someone else.... i had planned her to become a girlfriend to a first year Hufflepuff and that much i had planned with someone else.
Once i sat down and began to think how i wanted her to be i realised i wanted her to be a relation of the Malfoy's
i have a thing about Slytherin i made her gracefull and as if she owned the world...she was spoilt and was going to meet the Hufflepuff on the Train.....i knew the perfect person to represent her once i had her in my mind how she was going to be personality looks etc then i looked for someone to portray her.