Participatory Design's focus on people comes from a social democratic vision. However, as climate and existential crises press us to consider wellbeing beyond humans alone, we ask what a pluriversal design agenda might include and what could be articulated as ‘participatory’? Necessarily, this inquiry has limits, as participation usually implies human voice, rights, representation and structures of decision-making. This paper commits to these concerns while asking ethical, political and onto-epistemological questions regarding how worlds and futures are shaped when more-than-human entities – plants, animals, rocks, rivers and spirits – participate in our becoming? We offer a meeting of feminist techno-science with practices and philosophies from Japan and beyond to offer thought experiments in engaging with difference and plurality. And we give several examples of practice situated at ontological boundaries to offer some novel thoughts on ‘participation otherwise’, always-participating-with-many and the futures this could usher in.