Yay, Pudding, Evidence (and some Thesis SPOILERS)

[Meisatsu]

When Inuyasha was a child, he was chased after by three lesser youkai, from whom he ran, hid, and managed to escape...



The first youkai, which seemed to be the leader of the three, was the most ambitious, and found Inuyasha when he was only just reborn...



The second youkai appeared almost exactly a year later -- it might have succeeded had it not been for the quick thinking of the reborn Shippou...



The third youkai, seemingly the slowest of the three, finally appeared much later...

[Meisatsu]

The two nerds in question are the reincarnations of the boys named Taromaru and Suekichi, from the village whose Shujin was usurped for a time.



Walker's faithful and equally iron-fisted second-in-command, Bullet, is the reincarnation of Rasetsu, the long-time leader of a gang of thieves who attacked Onigumo. He met with Kikyou at the age of seventy, and told her [about Onigumo].



Careful, Danny, they just might kill you...for these two girls are the reincarnations of youkai slayer hopefuls Serina and Suzuna. They were a bit brash, trying to go out slaying youkai by themselves knowing only one mere youkai-slaying technique, courtesty of Sango. Thanks to Sango help, they learned to be a little more patient and reserved.



Johnny 13's main squeeze, Kitty, is the reincarnation of the young girl Koume, whose kitsune, Kuroro, was falsely accused of bringing misfortune to Koume's village and condemned by the rat youkai Tesso in the form of a kitoushi (charismatic spiritualist).

[Meisatsu]

They probably remember him...Ashley and the two other girls next to her looking lovey-dovey for Danny are the reincarnations of Kagome's three best friends: Arimi, Eri, and Yuka.



Akitoki, Hojou's ancestor from the Sengoku Jidai, was reincarnated as the Master of Time, Clockwork.



The bane of Clockwork's existance, the two Observers, seen in The Ultimate Enemy, are the reincarnations of Hakaku and Ginta, the two Wolf Tribesmen who always tag along with Kouga.



Box Lunch is the reincarnation of a girl named Mayu who died in a fire (which she actually unwittingly started), who was targeted by the Tatarimokke (Soul Piper) as a particularly bad kid, because she was bitter about her death and played pranks and had made several attempts on the life of Souten, her younger brother. Kagome saved her from going to Hell, though, and she mended her ways.