Opal is a very playful and mischievous little Mew girl who loves nothing more than to mess with humans, often by using her powers to transform them into Pokemon or to shrink them down, sometimes for the fun of it and other times as punishment for a perceived offense.

She may have her fun with them afterwards or leave them to their fate, but if she takes a liking to someone for whatever reason she'll transform them into a Pokemon and then take them home to her castle, where she will love and care for them but also treat them like her pets and playthings, doing as she pleases to them and punishing them if they disobey or try to escape.

Those her displease her one too many times are usually transformed into helpless plush toys, unable to move or speak -- and thus unable to run away or talk back -- but still alive and conscious, fully aware of what's happening to them but only able to voice their thoughts if she pulls their string.

It is unknown how many humans have fallen victim to her over the years, but she's always looking for her newest one...