Transformation items belong to one particular thematic set of collectibles with a special functionality:
Once Isaac collects three or more from one set, he will undergo a transformation that corresponds with the items' theme.
This category has the following 12 subcategories, out of 12 total.
- ► Bob Items (2 P)
- ► Conjoined Items (7 P)
- ► Guppy Items (empty)
- ► Poop Items (3 P)