It seems like you have a massive list already. So here’s a few more!
A few ones I enjoyed (mostly as a kid) which aren’t listed or mentioned:
Conan the Barbarian the Animated Series - very 90’s. I used to record it on VHS
Visionaries - Knights of the Magical Light. - Commissioned to help sell a toy line with holograms (all the rage in the 80s) Cartoon was pretty good quality for the time.
Pole Position- Ulysses 31 (currently seeding btw)- Jayce and the Wheeled Warriors - which are all French Japanese Cartoons scored by Shuky Levy who really encapsulates the sound of an 80’s after school cartoon for me. Even if the plot is a bit meh at times the intro music is absolutely cracking.
Around the World with Willy Fogg - Dogtanian and Three Muskahounds - Spanish Japanese production. Also great theme tunes!
ReBoot - (Ian Gibson who worked on 2000AD developed this. The CG might have aged a bit though! Kids cartoon but had some quite adult reference at the time)
Camp Lazlo - by creator of Rocko’s Modern Life
Whatever Happened to Robot Jones? - Short lived Cartoon Network offereing circa 2002.
No 70s Hanna Barbera? Short formats but I enjoyed Roger Ramjet, Batfink (both not Hanna Barbera) and Topcat (which is but was made in the 60’s.)
Mine I think, is younger than yours but absolutely adores Hey Duggee and Squirrel Club and they are very good with great music. Check out the Space or Music Video episodes in particular.
Awesome. Pretty cool he likes ReBoot. Sounds like such a fun breakfast morning. I’ve been trying to do something similar but they’re like little media limpets at toddler age; sticking to one thing and one thing only and of course atm it’s become Mr Tumble (an irritating clown whose schtick is that they dress up and do makaton). So while the weather has been nice I’ve been shucking mine off the rock, so to speak and getting them in the garden. Hope you have fun. :)