- The Hobgoblin (Amazing Spider-Man #238)
I've always loved the Hobgoblin as I felt he was my Green Goblin of the 1980s. His storyline that ran through Amazing Spider-Man was great as it kept everyone guessing as to his secret identity.
- The Symbiote/Venom (Secret Wars #8)
The Symbiote was a nice twist on the new costume gimmick. Eddie Brock was also a great new character, but early in the 90s, Venom's popularity led to some over-exposure which had me disliking the character more and more.
- The Puma (Amazing Spider-Man #256)
Really liked the calm and collected Thomas Fireheart and the complications that this millionaire added to Spidey and Peter's life. The Puma was a great character and went beyond the native american stereotypes.
- The Sin-Eater (Spectacular Spider-Man #107
The Sin-Eater storyline stunned me and the shocking death of Jean DeWolffe was a complete surprise. This four issue story arc made me aware of Peter David for the first time. He did an amazing job fleshing out the Sin-Eater and really getting into his head.
- The Rose (Amazing Spider-Man #253)
The Rose was a solid addition to the New York mob landscape of the Marvel Universe and his connection to the Kingpin made him that much more powerful and that much more of a threat.
- Tombstone (Web of Spider-Man #36)
- The Foreigner (Web of Spider-Man #15)
- Hydro-Man (Amazing Spider-Man #212)
Hydro-Man was a simple take-off on Sandman, obviously substituting the sand for water. He doesn't really live up to his potential for another few years at which point he joins the Sinister Syndicate.
- The White Rabbit (Marvel Team-Up #131)
- The Spot (Spectacular Spider-Man #99)
- Slyde (Amazing Spider-Man #272)
Okay, okay, I know it's 11... :)