So it sounds like I have some research to do and maybe start adding to my Wii library.
I'll save you some research-
The Last Story - My favorite RPG of that generation. some of the OG Final Fantasy dudes worked on it, and the battle system was good enough to warrant online multiplayer.
FortuneStreet - Basically Mario Party x Dragon Quest. and way cheaper than the main MP titles.
Klonoa - iirc it's a remake of the PSX game(?) but it's a real fun 2.5D platformer.
No More Heroes 1/2 - the PS3 version of 1 is better, but they're both fun hack n slash games with the suda51 flavor.
Mario Sports games (in particular Strikers) - "blah blah blah, easy to play hard to master, blah blah blah" they're fun.
Pikmin 1/2 - the way the games were meant to be played.
Zack & Wiki: the Quest for Barbaros' Treasure - think old school point 'n click adventure, but with the 'thing' being it's about how you hold & use the remote. fun problem solver.
De Blob - I'm a sucker for games about color & music, this one has some nice personality, plus it's like $5.
And yeah, Gamecube games with ypbpr. It's like...a BUTTCRACK worse than a GCN with GCN ypbpr cables but lol at the price point of those cables.
https://www.monoprice.com/Product?p_id=5689&gclid=CjwKEAjwxurIBRDnt7P7rODiq0USJADwjt5DZKHKuzYt1wg6bnzMFLM9mlpuqc6QhSPoasf0BMY9qRoCojvw_wcBI've been using these for years, great cables