Szayel (Bleach) implanting himself in Nemu, and reincarnating himself into an undamaged form.
Eriol Hiiragizawa (Cardcaptor Sakura) is the reincarnation of Clow Reed.
Piccolo Jr. (Dragon Ball) is the reincarnation of King Piccolo.
Uub (Dragon Ball Z) is the human reincarnation of Kid Buu.
Greed (Fullmetal Alchemist) meets Ling Yao...
...and is reincarnated onto him.
Yuca (Immortal Rain) is the Spirit of Methuselah, and has constantly been reincarnating since the beginning of human history.
Kagome Higurashi (Inuyasha) alongside her past life, the priestess Kikyo.
After their deaths , Asura's and Indra's Chakra (Naruto) have been reincarnated to vessel's worthy of their chakra, their current vessels are Naruto/Asura and Sasuke/Indra.
Orochimaru (Naruto) using his "Living Corpse Reincarnation" to reincarnate himself into a new body, thus erasing any permanent damage and aging.
Two years after becoming a God Hand, Griffith (Berserk) was reincarnated on earth, with the full power of his God Hand form of Femto at his beck and call.
Mavis and Zeref (Fairy Tail) meeting once again after being reincarnated as Arius and Mio.
Elizabeth Liones (Nanatsu no Taizai) is the 107th reincarnation of a goddess cursed with a perpetual reincarnation.
After the Noah were killed by the betrayal of the Nea D.Campbell except the Earl and Road, Noah Clan (D.Gray-man) every member were reincarnated by each generation awakening their Noah Genes over again except for Skinn Bolic.
Soma Cruz (Castlevania) is the reincarnation of Dracula.
Althena (Lunar) has reincarnated as a human more than once...
...Luna Noa being one of them.
In its death throes, the Metroid Prime (Metroid) steals Samus Aran's Phazon Suit and a sample of her DNA...
...and uses the two to reincarnate as Dark Samus.
Heather Mason (Silent Hill), the reincarnation of Alessa Gillespie.
Michael Roa Valdamjong (Tsukihime) is nicknamed "The Infinite Reincarnator", having reincarnated 18 times in 800 years.
Hieda no Akyu (Touhou Project) Memory of Gensokyo, The Ninth Savant, is the current "Child of Miare", who is born in the Hieda family once in every few hundred years with the ability to "not forget anything she sees" and record Gensokyo's history.