So, the players go on strike, and scabs have to be hired. Fair enough. Why did the cheerleader captain have to hire a whole new squad of cheerleaders? Did they go on strike to show solidarity with the players?
I haven't seen the film in years, so I can't recall if it was covered, but that might actually be exactly what happened. Many times, when one specific area of an industry is on strike then other areas might strike as well in order to show solidarity and support. They might also have been legitimately striking for their own better wages or benefits and coordinated with the players for the timing.
So, the ad Todd and Riley found was meant to replace "uncool" parents with "cool" ones. Now that's an asshole-ish thing to do with your parents because they are not "cool", right? Later I remembered that just about every replacement made ended up in An Aesop that leads to Todd or Riley deciding to undo the replacement. Therefore, it is easy to assume that any other kid who wanted cooler parents will most likely learn that they are no replacement for their true parents and do the same. Todd and Riley were orphans, so they got an exception.
Tasumi's armor being a Japanese Halloween costume in season two may seem like a stretch, but it makes perfect sense. We never see her costume doing anything usual, and it can be repair by using duct tape.
Okay so Conrad is Riley and Todd's uncle; I can work with that...except for one tiny detail...WHY ON EARTH DIDN'T HE ADOPT THEM HIMSELF INSTEAD OF JUST GIVING THEM REPLACEMENTS AS PARENTS?! You can legally adopt biological relatives and I'm pretty sure that orphans will be sent to close biological relatives by the legal system if they're deemed fit for adoption.
He explained that he knew nothing about parenting and thus being afraid that he's not up to the task. Also we never seen any suggestion of Ms. Fleemco existing so perhaps he preferred to give them full family and help from the shadows. It is not the soundest thing to do, but people not always act reasonable.