Board Thread:General Discussion/@comment-36489730-20181023130319/@comment-28362353-20181023140439

Yeah. I think the best way to explain it would be:

8, 16, & 19 (Im pretty sure 8 & 19 were both 100% Machine like 16), Arale & Gatchans, & Mira = Androids

13, 14, 15, 17, 18, & Gero = Cyborgs

Cell & 21 = Bio-Androids

As you can see, some are actually androids, others arent. However, they are all referred to as androids in the series, which is why they are in the category. This is not the case for the Meta-Coolers, as they are never reffered to as androids, are just robots (more specifically drones).

You could try argue the Meta-Cooler Core is one, but even then he's technically a Cyborg, not an android, as he's half Cooler, half machine. However, this still doesnt change the fact that neither the Meta-Coolers nor the Meta-Cooler Core were ever referred to as androids. Which is why they are not in the category.