Future AI persons might both (1.) deserve moral consideration and rights fully equal with natural human persons, and (2.) have lifeways so radically different from ours as to break familiar patterns of moral thinking by violating our ordinary background assumptions. This article presents a series of thought experiments about strange AI persons, centering on a two-pronged worry featuring two types of "monster". "Utility monsters", who derive great personal benefit from harming others, create a well-known challenge for ethical systems that aim to maximize aggregate goods. The less-discussed case of "fission-fusion monsters", who can divide and merge at will, presents a complementary challenge to ethical systems focused on individual rights, since individual rights frameworks require the existence of stable, countable individual persons. AI cases dramatically expand the range of possible lifeways, creating untested problem cases for ethical systems that assume persons of the familiar humanlike sort.

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