Yup yup. Exactly what I thought when saying partial shared consciousness. But I think the minds would basically be clones when the mutation happens, then after, the minds would be different entities and could steer into different directions. And yeah, if there’s a shared link between their minds and they share the same body, sensory stimulus would basically double. Hehee, so fun, didn’t think much about the added head honestly but it is a really major addition.
EDIT: I wanna make a two headed OC now ahah
Gotta think it trough, but could make a really awesome character!