Thought I'd share an idea

I made a response to this thread about assigning each of the HuMane 7 a traditional element (fire, water, earth, blah blah blah). I like adding grounded logic and scientific concepts to explain esoteric phenomena. I see a lot of uninspired or poorly thought-out story concepts so, rather than just complain, here’s an idea I’m sharing for anyone to use, if you like. I’m not pretending it’s wholly original or groundbreaking, but I was a little proud of it, to be honest. You don’t even have to credit me, just have fun with it.

Under the traditional elements of nature in fantasy, there are:
Fire
Water
Earth
Air
Electricity
Light
Dark
Mind

Assigning them to what I think matches both the character and their ‘Harmony’ powers, I’d go with

Mind - Twilight
Psychokinesis - Most of her powers come from moving things with thought, but she can also make portals, as evidenced by Midnight Sparkle. With enough knowledge of how any system works, one can literally do anything with this power. This would be directly imposing one’s desires on reality by bending/tearing space and manipulating matter, hence, Mind.

Earth - Applejack (duh.)
Super strength/durability - Applejack’s honesty is a preservation of objective Truth. What is stronger, more immutable, and enduring than absolute Truth? It is the bedrock on which a stable reality is built.

Light - Rarity
Illusions/Energy constructs - Rarity’s obsession with the visual arts gives her a penchant for creating things that manipulate and guide one’s perceptions, but with the ability to manipulate energy, she can also construct anything she can visualize from light and harden it into physicality.

Electricity - Sunset
Emotion sense & manipulation/Electrokinesis - Just about all carbon-based lifeforms and their brains work on electricity and the brain gives off significant electromagnetic radiation. Having an intuitive understanding of what certain patterns and signals mean would allow Sunset to understand how someone feels, but also to induce certain feelings.

Air - Rainbow Dash
Flight/Superspeed - Rainbow Dash is a free spirit and impulsive, running on instinct at most times. The wind characterizes this far more than anything else. It flows over and through things with no effort or second thoughts and even if it leaves in a hurry, it’ll almost always come rushing back.

Water - Fluttershy
Healing/Animal empathy - Something we all have within us and can’t live without for long, water. But also kindness. Water is gentle, but can crash with the force of a boulder under the right (or wrong) conditions. It is also dynamic and can fit into just about any niche, if it is of a mind to. Pure water has long been thought to have healing properties and who more flexible, pure and gentle, but with a potential to be harsh, than Flutters?

Dark/Fire - Pinkie Pie
Entropy Acceleration/Transmutation - Weird one, right? Exactly. What is darkness than the most pure manifestation (anti-manifestation?) of ultimate entropy? Pinkie’s powers have been shown to take materials that are high in energy potential (sugary treats) and convert that into work, but not without loss. This is a form of what has been considered ‘alchemy’ in ages past. Pinkie’s erratic, energetic nature is a ‘black hole’ of energy. She is constantly doing something, productive or not, and sucking up even more energy and matter from the world around her to fuel her activity. If more things in the universe were like Pinkie Pie, it would be a dark, cold universe a lot sooner. Still, without darkness, we would not know light. In that way, it brings light to existence. Darkness can also be as much of a comfort as it can cause anxiety, much like Pinkie’s tendency to speak volumes of the things one doesn’t want to hear, but also make them laugh when they didn’t think they could.