L
- Lady Lark
- Layla Miller
- Lee (first name unknown)
- Leech
- Leviathan
- Liam Jenkins (Black Death)
- Lieberman (first name unknown)
- Lilandra Neramani
- Lizard (Connors, Curt)
- Lockjaw
- Loki
- Longshot (Centino, Arthur)
Read more about this topic: List Of Ultimate Marvel Characters