These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complete Monster: Grand WitchGrandienne deliberately sent her children out to die, brainwashed one to kill another on several occasions, banished one to Hell, and resurrected two of them as brainwashed zombies. As fitting of the family theme in GoGoFive, Grandienne stands for everything the Tatsumi family bond isn't.
Fan Nickname: Venus: for Denus whose name came from Undine + Venus, and is similar in appearance to Venus. It even makes sense as Venus is a goddess that was born from waves.
"Colonel Sanders" for Dr. Mondo Tatsumi, due to his uncanny resemblance to said Colonel.
The Woobie: Erika, a little girl who was on episode 17. She liked Matoi and did a lot for him, from washing his clothes to making dinner for the whole family. Matoi had to be harsh with her so she could go away from danger, which is kind of understandable. Her reaction, however, was totally heartbreaking.
Jerkass Woobie: Zylpheeza is a villainous example. He may a horrible demon, but at the same time he watches his younger sister give her life to revive him, against his will, and has to watch his younger brother die after being forced shoot him by his own mother.
Visual Effects of Awesome: It's not even that complicated of an effect, but seeing the Grandliner tower over a couple of Saimas is... satisfying.