I keep a number of characters at certain levels so I can always join in when a friend has the time and wants to play. I also made a bunch of different endgame builds back when 20 was cap. I sometimes return to fix up an old character that has been buried by modern updates, which then inevitably gets buried again by new modern updates.
Yeah, me too. Seven real toons, one more for testing and playing with a casual friend, 4 old "shelved" toons that I use to play with different friends who only play once or twice a week (they are also partial mules), and then mules, lots of mules: special items &pots, rare scrolls, tomes, several daily/gold dice (the stones accumulate when I'm in the cap or doing iconic lives), cosmetics one (this one has all the space bought - don't judge me), cannith crafting banks, mules with gear based on levels (1-5, 6-9, 10-14, 15-19, 20-29, and several legendary mules), etc.
And on top of that, I have two mules that I only have when I'm VIP (and delete when I'm not) that are usually empty, but when I do a TR I dump some stuff from the shared bank into one to make room there, and into the other I put the character's bta stuff that I won't need until epic/legendary levels.
Yeah, I could use a few more slots lol.