there's something to be said about the choice to use "prince" as the main signifier of military rank for the andalites. because it kinda obscures the truth of the situation, doesn't it? a group of kids getting magic powers from an alien prince sounds whimsical and delightful. a group of kids getting pulled into a war by an alien colonel sounds tragic and horrible. the slow reveal of what "prince" actually means over the course of the early books is perhaps the most underrated twist of the entire series, because it fundamentally recontextualizes the entire premise of the series without the reader even consciously realizing it.
Including OP's tags cus they were good
Remember, kingdoms are always neutral-to-good and empires are always evil. Princes are what the good guys have. Bad guys have military rank.
"Frightened though they were, some of the animals Andalites might possibly have protested, but at this moment the sheep set up their usual bleating of "Prince good, Corporal bad," which went on for several minutes and put an end to the discussion."