Cowboy Bebop
It was a cool ride, each and every character has a soul, a story and a reason, this is wat propels most of the adventures as you care for what can happen to the protagonists. They like and care for each other, despite that they don't admit it, creating cool dynamics and more internal conflicts. Each episode has a story that hooked us not just because there was an objective, but because a Bebop crew member had some sort of connection with and it increased the stakes.
The music, the animation, the designs, totally timeless and simply cool.
See you space cowboy, what an amazing anime.