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.
Nightmare Fuel - The Expies of Heavyarms, Sandrock, and Shenlong were melted down to provide General Zeong with Gundanium armor. Remember, these are living beings we're talking about here.
Older Than They Think - The roots of this series have been around since at least the 1980s. Lacroa and Ark are the default universes for the Knight Gundam and Musha Gundam storylines respectively, and the designs for most of the Neotopian Gundams and Dark Axis characters are lifted wholesale from the Game Boy game SD Gundam G-Arms.
Toy Ship - Shute and Sayla, and, later, Rele and Shute.
Villain Decay - The Quirky Miniboss Squad were all dangerous when they appeared initially, but were reduced to being completely harmless later. Tallgeese also suffers from this.
Cobramaru also. He first appears with a reputation for bringing down 9 castles in Ark, but time and time again success is juuust pulled out from under his nose by Shute and Captain. Eventually, Kibaomaru decides to just fire him.
This trope is lampshaded by the Zako Soldiers during the Zako Zako Hour.
What an Idiot - Destroyer Dom. He spent an entire battle taking advice on how to work his gun from the enemy, and was surprised when it blew up in his face. Bakunetsumaru occasionally falls into this trope as well.