Jacob (Rise of the Tomb Raider); via the Divine Source
Beatrice (When the Seagulls Cry)
Ange Ushiromiya (When the Seagulls Cry)
Battler Ushiromiya (When the Seagulls Cry)
All God Tier characters (Homestuck), so long as the death is not Just or Heroic
Jason Voorhees (Friday the 13th)
Mr. Immortal (Marvel Comics)
Phoenix (Valkyrie Crusade) will always be reborn, each time with a different personality.
No matter how many times Mario (Super Mario) and his friends die, he can come back to life as long as he has one.
As long as Phantom (Marchen Awakens Romance) has the Zombie Tattoo, he will always return from the dead.
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.