Szayel (Bleach) implanting himself in Nemu, and reincarnating himself into an undamaged form.
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.
Eriol Hiiragizawa (Cardcaptor Sakura) is the reincarnation of Clow Reed.
Piccolo Jr. (Dragon Ball series) is the reincarnation of his father Demon King Piccolo.
Uub (Dragon Ball Z) is the human reincarnation of Kid Buu.
Due to having permanently assimilated the Grand Supreme Kai, Majin Buu (Dragon Ball series) has essentially become his reincarnation after expelling all his inner evil.
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.
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 Uzumaki/Asura and Sasuke Uchiha/Indra.
Orochimaru (Naruto) using his "Living Corpse Reincarnation" to reincarnate himself into a new body, thus erasing any permanent damage and aging.
The Otsutsuki Clan (Boruto) can reincarnate themselves into whomever they brand the "Karma", though perfect compatibility is rare, as both Kawaki and Boruto Uzumaki are.
Isshiki Ōtsutsuki (Boruto) reborn through Jigen's body.
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.
Hao Asakura (Shaman King), reincarnation of Mappa Douji.
Vandalieu (The Death Mage Who Doesn't Want a Fourth Time) is a reincarnated individual and can use Death-attribute magic to perform pseudo-reincarnation on others.
Soma Cruz (Castlevania) is the reincarnation of Dracula.
Master Xehanort (Kingdom Hearts) has reincarnated and faced Sora in various forms. From left to right: Ansem, Young Xehanort, Terra-Xehanort, and Xemnas.
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 Series), 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.