* IdiotPlot: The plot of "Neutron Star" depends on pretty much every named character not expecting tidal forces around neutron stars, despite such forces being clearly understood in the 1960s, when the story was written.
** Although "Neutron Star" was retconned later in ''Crashlander'' and ''Juggler of Worlds'' to be a limited perspective on a deeper Puppeteer/ARM game where the only person not truly aware of the tidal force was Beowulf. It's still' pretty dumb of a pilot not to know this.
* ItsTheSameNowItSucks: There are two things preventing ''Fate of Worlds'' from being a satisfactory conclusion to the ''{{Ringworld}}'' series: Louis is mostly only a passive observer of events, just like he was in ''The Ringworld Throne'', and the ending is essentially the same as that of ''Ringworld's Children'' in that it involves [[spoiler:moving multiple-planet-sized objects through hyperspace to get away from attackers]].
* MagnificentBastard: Ol't'ro.
* MarySue: Peace Corben from the Man-Kzin Wars stories, ''in spades''.