Probably one of the best of the era, I think (through nostalgic eyes), great animations, great music, nice presentation of the characters and their abilities, decently close to the comics, too. Had a special magic for me because the series was never launched here in Denmark and so I had to watch it on my friend's NTSC video cassetes (European standard was PAL) which his purser father brought home from the US or Singapore, where the covers opened up the wrong way.
Generation 1 of Transformers was really good, especially third and fourth season where content became much darker (also interesting is the history of the studio in same period, fleshing out an originally toy marketing scheme with heavy lore writing to give it depth and capture the minds of young consumers), season 4 also features the best version of the theme, I think.
A welcome change from the very silly first cartoon series, this one follows Sega's attempt at branding themselves as more mature, dark and violent than Nintendo, their main adversary. Sonic and his animal friends fight in a post-apocalyptic scenario against Dr. Robotnic's forces trying to industrialize all of the forest, features adult themes which is rare for the 'morning cartoon' genre, which aims at younger children than for example Batman and X-men. As you can hear even the music theme was somewhat different.
M.A.S.K was another semi-magical series which sadly was never launched in my country and which I couldn't watch on Sky; I only knew about it from a single VHS I had. Pretty cool, though.
TMNT was the shit, we all watched it, we had it on NES and Gameboy, we dressed up as it for Fastelavn (Scandinavian carneval), we traded stickers in school and played with the action figures in daycare.
Another one I only had on VHS, but great universe, well-written and nice drawings for the time. I reckon it made me suspectible to Western/Cowboy Sci-Fi from an early age, probably one of the reasons it's been so easy to embrace series such as 'Firefly', and games such as FNV in my later life.
You may think this is only for small kids and girls, but then you'd have to watch it again.
Manga from when it was rare and nerdy in the West.
Batman.