These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
That One Boss: The Phantom from Penny Racers Party: Turbo-Q Speedway, (Choro Q Wii). Not only is he bigger than everyone else, but he is also surprisingly fast for his size. Not only that, but he's also guaranteed to catch up with you if you don't have the right parts. Not only that, but the track you face him on, The Lab-o-rinth, is also pretty difficult because of the track's complicated layout. Making this boss surprisingly Nintendo Hard.
Atlus gives us Kamikaze from Choro Q. Especially on Trans Trip SL. Once he gets ahead of you, there is absolutelty zero chance of you ever catching up.