Most modern idle animations are boringly realistic. Your characters do what you would do -- like stretch or scratch themselves. It's better when these animations reinforce the idea that your avatar is alive and part of the gaming experience with you. Whether it's in-jokes or breaking the fourth wall by blatantly asking you what the hell you're waiting for.
And then there's the rare type of idle animation that can actually cause a Game Over. As in...
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RAIDOU Remastered revives a cult classic with polished combat & demon summoning, but repetitive battles limit its greatness.
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Conker's Bad Fur Day definitely has some of the best idle animations ever.
LOL get game over with Sonic. I didn't know he could talk in those days.