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.
YMMV: Para World
Demonic Spiders: The SEAS robots, in particular the executioner due to its damage bonus against every unit type.
Ensemble Darkhorse: the Spinosaurus. Appearing in exactly two missions of the original campaign, it is nearly ubiquitous in user created maps.