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The Question knows the true purpose of aglets, as we see at 6:45 in this video:
https://www.youtube.com/watch?v=xDBxlOfJnoQ
Was the series you're thinking of "Justice League Unlimited"?
No, it's most assuredly not JLU. I'm beginning to wonder if I imagined it.
I didn't think it would be JLU, but you never know. Sometimes what's obvious to one person might not be so obvious to a vague childhood memory.
Anyway, there's this:
https://tvtropes.org/pmwiki/pmwiki.php/Main/WhatTheHeckIsAnAglet
There isn't much in the Western Animation category there, but it might be worth a look. Sorry I couldn't help.
Bumping, since I still have no idea what it was. Thanks for trying to help, Erica B.
Monster Farm?
Yeah, Jason Kreis ain't exactly a soccer star.
Lloyd In Space? (The page lists a single Token Human character.)
"If it ain't broke, don't fix it. And even if it is broke, just ignore it and maybe it'll be sort of OK — like the environment."
There was a conversation about aglets in Dave the Barbarian.
fifimcfeef: I think it WAS Monster Farm. I can't find much on it, but the opening credits look right. I daresay we just solved a mystery that's been bugging me for over ten years. Good on us!
Glad to habe helped you. Jack was the human farmer. Too bad the show shares a name with Monster Rancher. It was random, but I may have been right!
Edited by fifimcfeef Yeah, Jason Kreis ain't exactly a soccer star.
It was on probably in the late 90s or early 00s. There was this one normal guy, and everyone else was some kind of monster or creature. The only thing I remember happening in it was the guy talking about aglets. That sticks in my head because that cartoon was the only reason I knew what an aglet was.
I'm fairly certain it was a series. But for all I know it may have been a movie.