What do they mean by hero swim swim chao and a dark run run chao

Lets pretend you have a baby Chao.You turned it white with a hero character.then you gave it swim animals.then it grew up.now its a hero swim chao.then you gave it handful of swimming animals after it grew and now it looks different than before.ok,so its a hero swim chao.but since you gave it swim animals,it now becomes a hero swim swim chao.its the same for the dark run run chao,too.