Building upon recent studies in new materialisms and feminist critical posthumanism with a focus on human and more-than-human relationships, this paper examines how the posthuman paradigm, by postulating the queering of identit(ies) via entanglement with the more-than-human (including technology), and by offering a critical examination of diverse modes of existence within a broader ecological context, can foster more inclusive and ethically sound ways of being in the world. Although posthumanism encompasses a wide range of perspectives and theories, including transhumanism, at its core, it challenges traditional notions of humanism, blurring the boundaries between what is human and what is more-than-human, while calling for a revaluation of anthropocentric, onto-epistemological, and ethical frameworks. This paper mobilises the framework and methodology of composting-with-care as an analytical tool to foster epistemic diversity, from quantum field theory to speculative fabulation, in the examination of the issue concerning human identity. It concludes by proposing a view where the self is not confined to the individual human but emerges through interactions (and intra-actions) with the world(s) of which the human is part, acknowledging the agency and influence of actors beyond the human on identity formation.