If you loved Slayers Return, try Slayers: The Motion Picture
A bridge between a film you've already seen and one most people haven't. Slayers: The Motion Picture has roughly 64.8× fewer votes than Slayers Return — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Hiroshi Watanabe, and they both carry the playful mood tag, and they sit in Animation / Comedy / Fantasy territory. If that's the register that drew you to Slayers Return, the second film will land in a comparable space — through a different lens.
What Slayers: The Motion Picture is
One imagines this anime feature played very well on laserdisc. Lina Inverse must travel through time to prevent a terrible wrong. Anyone seeking knockabout magical adventure will find exactly that.

