 If you liked
Slayers
|
 ...then you might like
Ichiban Ushiro no Daimaou
|
Both deal with magic and have a Demon Lord character (though for only some episodes in Slayers). That's pretty much all the similarities between them. Slayers is more adventure and comedy oriented, while Ichiban is more ecchi, and although Slayers shows its age, it's still a better show than Ichiban.