Does anyone else's favorite character change depending on the season of the show? Whenever someone asks for my favorite pony, I genuinely struggle to give a concise answer.
If I say "Pinkie Pie" people assume I also like the screechy, flanderized vexation of the spirit she devolved into. Sweetie Belle is still fairly enjoyable, but not anywhere near as much as her appearances in seasons 2~4; I might even go as far as to say she has become a teensy bit bland in recent seasons. I had a brief honeymoon phase with Twilight after she attained God-hood due to her overall shift to more quirky/ awkward yet still endearing personality traits. But even then, that aspect was soon eclipsed by the newly reformed Starlight. With only one season left to go, I think it's safe to say that neither Cozy Glow nor Ocellus will overtake Glim-glim completely, meaning that the latter will likely remain in my #1 spot for the longest duration out of any character to date. But thinking back to how utterly obsessed I was with Pinkie back when I first discovered the show in 2011, or my budding adoration for Sweetie Belle for what seemed like an eternity, it is hard to compare that level of affection to what I feel for Starlight currently. Sure, she's by far the most consistently enjoyable character to watch post-S5 and I look forward to pretty much any screen-time she gets... but I suppose I just don't feel the same level of "passion" for her as I did for PP & SB back in the early days.
For the sake of reference, I am not one of those people who thinks FiM has been getting worse and worse as time goes on. Personally, my ranking of the seasons would be something like this:
5>4>6>7=8>3=1>2. So, my lack of enthusiasm for Starlight Glimmer clearly isn't a result of poor seasonal quality, at least not from my perspective.