Biollante. While the film wasn't the success Toho hoped, it still remained a popular monster, though not enough to make a reappearance.
Kuroki is also well liked.
The Biogoji suit is widely considered one of the (if not the) best designs the Big G ever had.
Hell Is That Noise: Biollante's roar, mainly in her Rose Form. Never before has a Humpback Whale's cry sounded so terrifying.
Narm: The english dub was produced by theinfamouslyknownOmniProductions, so this is to be expected. That being said, the dubbing this time around is somewhat more competent than their usual fair, and depending on your preferences, can still be ratherenjoyable.
"We're the lethal weapon!"
The opening gun fight is ridiculous with no one stopping to fire at targets that are just ten feet in front of them. On the bright side the Saradian Agent's boring but practical methods of ambush and sniping are far more effective.
Narm Charm: Biollante dissolving and allowing Erika's spirit to ascend into heaven. It looks quite silly, but it can still be rather touching in the right mindset.
Meta example, also a Funny Moment; the official MPAA rating for this film has it rated PG for "Traditional Godzilla Violence".
Older Than They Think: Shinichiro Kobayashi (the dentist who came up with the script) actually first wrote the script when he was 16. It was pitched to Tsuburaya Productions as part of a contest to make your own Ultraman episode. It won and went on to become Episode 34 of Return of Ultraman, "The Life that Can't be Forgiven" where Ultraman Jack battles Leogon, a giant Planimal created by a scientist.
Surprisingly Improved Sequel: While "The Return of Godzilla" is still considered one of the better movies in the series, this film is considered an improvement in terms of special effects and pacing as well as having more interesting characters.
Vindicated by History: Back when it was made the film didn't do quite so well, prompting the return of Ghidorah, Mothra, Rodan and Mechagodzilla in following films. Nowadays its considered one of the absolute best of the Hesei films alongside vs. Destroyah, and one of the best films in the franchise overall thanks to the high quality of the effects.
The loss of his daughter is what causes Shirigami to create Biollante. Especially since it's not a Kaiju attack that kills her, it's a terrorist bomb and he's too far away to save her. It's even more heartbreaking in the first battle between Godzilla and Biollante in Fridge Horror terms. As Biollante is burning, he is basically watching his daughter die again, only this time it's right in front of him.
Vindicated by History: While the movie was something of a box-office disappointment (necessitating the return of the old favorite King Ghidorah in the next film), it's gone on to be very fondly remembered. When fans and movie critics rank the best films in the series, Godzilla vs. Biollante often makes the top ten.