Irresponsible Captain Tylor if you’d like a good old school spoof of space operas. I can only reccomend the TV series though since I’ve heard the OVA sequels turn serious (why make a parody show try to actually be the show it parodies?)
The Slayers series
Still, one anime that I must reccomend to you is Baccano!. If you want something unconventional then this is the anime for you. The story is set in primarily 1930s America (and is surprisingly accurate in that presentation) presented from multpile viewpoints over multiple time periods. The story may seem a little confusing to follow at first, but you get used to it and at the end everything wraps up nicely. It’s also surprisingly light hearted for an anime set during the Great Depression and the majority of the characters are gangsters, and the humor, especially from two characters Isaac and Miria, is genuinely funny. The show also has a large cast of characters and almost all of them are memorable, which is not an easy feat considering this is a 13 episode (16 if you count the OVAs) series. And one more thing, the dub for this series is perfect, way better than the Japanese dialogue and I do not say that lightly as I’ve watched the series subbed, and it also features a number of my favorite seiyuus who all do a great job.