Even not counting all my fosters, all my roommates' cats, and all the other little ones who were in my life temporarily, I still have a sadly too-long list:
Zebo - my first cat after I left home, a sweet fat mama's boy, a gray tabby, he died at 14 of kidney disease
Brie - solid black, disappeared when he was about age 2 when the landlord left the door open while fixing the A/C while I was at work
Pogo (Brie's brother) - a beautiful blue glossy boy disappeared a few months after Brie when I was critically ill in the hospital for several weeks and my cats were being shuttled from friend to family
Bunky - a beautiful, silky long haired solid black kitty with a wonderful sense of humor, hit by a car during the same hospitalization when my mom refused to close her cat door as long as she had foster cats, he was probably about 3 or 4
Toot - my only orange boy, and another mama's boy, but loud as a siamese, disappeared when my roommate's kid let him out when he was about 7
Yankee - a feisty little calico, died in an accident when she was four
Doodle (Boosie) - Yankee's sister, a tortie-point who "did tricks" (she would head-butt the floor and roll right over in a somersault!), she died with Yankee
Cosmo- a beige long haired, possibly my most favorite of all my cats, past and present. I still grieve for my little fuzzbutt. Such a character! And so beautiful! I could fill up a whole topic just on the little guy. He died when he was two, in the same accident that took Yankee and Boosie, who are a close second and third in my list of most-loved cats. They've been at the bridge over two years now, and I still think of at least one of them daily.

But I love my current four so very much, too, and I hope they all stay around longer than Zebo! I have no roommates, my landlord does not have a key so cannot come over unless I'm home, and I have told all my friends that in no circumstances does my mom ever get my cats! I also watch for potential accidents. They are also inside cats (excpet Peaches who loves to escape) so hopefully I now have all the bases covered!