Due to being immortal, Nathan's (Misfits) body can repair itself to is pre-death state and wake up good as new.
Rowena's (Supernatural) Resurrection Seal will always bring her back from death's door.
Rayna Cruz (The Vampire Diaries), after her death, her body spontaneously self-combusts only to reborn.
Wendy Beauchamp (Witches of East End); Wendy has nine lives to live. Whenever Wendy dies, she loses one life and another one begins.
Misty Day (Coven) a witch was skilled at resurgence, and resurrected many characters, including herself.
Like his fellow cylons, Cavil (Battlestar Galactica) can resurrect upon death by transferring his consciousness into a new and identical body
Himuro Gemma (Ninja Scroll) uses his "Reincarnation Technique" to resurrect himself from otherwise lethal injuries.
Lazarus demon (Charmed) always resurrects unless his ashes are buried in a cemetery.
Claire Bennet (Heroes) can resurrect herself unless her brain is destroyed or her body is split in two and separated.
Brook (One Piece) revives after being decapitated.
Tenzen Yakushiji (Basilisk) having his symbiote "eat" away his wounds and restoring any ravages of time or battle, even fatal wounds to bring him back from death.
Berserker (Fate/Stay Night) resurrecting after his head was blown up.
Joshua Foley/Elixir (Marvel Comics) can bring people back from dead including himself.
Christopher Muse/Triage (Marvel Comics)
Morgan le Fay (Marvel Comics) has been 'killed' more times and in more varied ways than any other villain in the Marvel Universe. Despite this, she has survived each and every single time, most often appearing seconds later after her 'death' seemingly unharmed.
Due to the Immortality Curse placed on him by the Demon King, Meliodas (Nanatsu no Taizai) is able to return to life after dying in exchange for his personality to degrade to his old evil being.
Phantom (Marchen Awakens Romance) will always come back to life as long as the Zombie Tattoo curse remains on his body.
Orichalcos Gigas (Yu-Gi-Oh!) is one of the few monsters that resurrects itself when killed.
Mitchell Shelley/Resurrection Man (DC Comics)
Ichibē Hyōsube (Bleach) is resurrected due to Ichigo calling his name.