Hi Monique,
Choosing a toy brand is not a good idea. Doing 4 different sub brands is also not very helpful and being toys it may lead to gimmicky graphics that easily translate to spiderman, nerf, etc. However, if you want to be a toy designer then go for it.
It would be better to choose one brand and really break down their design language and apply it to the sleds. Try not to use their logos as the differentiating factor.
What are some brands of products your really like? What design language/characteristics do they use?
Dyson, Dewalt, Alienware, Audi, Fiskars, Bosch, Electrolux, etc.