The present invention generally relates to apparatuses having some characteristic(s) of traditional "roly-poly" toys, which are traditional passive toys that, when struck, wobble about their typically-rounded base but stay upright due to bottom-heavy weighting. Some embodiments of the present invention can be especially relevant to such an apparatus that is mobile and/or not totally passive. For example, some embodiments of the present invention have locomotive ability, for example, via one or more wheels or other type of roller(s)