Can あなた post an アイコン that あなた used the most longest time?

I think it must have been this one.

Summer Ishtar from Fate/Grand Order.

Was my プロフィール アイコン for at least 7-8 Months as far as I recall? Mostly because of the fact this happened during the longest hiatus I happened to take from ファンポップ as well so there あなた have it XD !!!!

6 years

Probably this one. I barely know it tbh.

I think you've all noticed that I always default back to Rey lol. Allow me to plug the artist's link

Also had link for a long time circa 2010-2011. Pretty much just used text-based アイコン in my first few 年 または so of ファンポップ

This one. I believe I had it for several years before I started changing my アイコン again.

I think it was this one