Super Mario Galaxy is one of my favorite games of all-time. The gameplay, the atmosphere, the music... and Rosalina was intriguing. So I decided to main Rosalina & Luma as soon as they were revealed, especially as their play style looked very interesting to me. At the very least, RosaLuma was the character I was by far the most interested in, and I would always go out of my way to look for her videos during E3 and other pre-release events.
Now when I use RosaLuma, people think I use her specifically because she is top tier. Sometimes people even complain about my using her.
How does that make me feel? Short story short... it doesn't bother me at all.
I've also been picking Yoshi up as a character both because I like Yoshi and because he just feels really good to play. Do I care that it's another top tier? No.