I dont think anyone can deny how Oro and Voldy are similar but sometimes its just weird to see how similar they are.
1) Orochimaru and Voldemort both want to become Immortal to escape death and learn all the jutsu they can
2) They were both young geniuses who were the best in their age group.
3) both of them look like a snake
4) both of them use snakes as their main theme
5)Both of them wanted to kill the head of their village/school (Hiruzen and dumbledore)
6) Both of them brand their followers with some type of mark (death eater mark and curse seal)
7) Both of them love using the dead to fight ! (edo and Inferi)
8) Both of them had identical ways of coming back to life. They basically kept a piece of their soul somewhere safe in order to resurface again ! (Horcrux and Curse mark)
9) Both of them are always cold and malicious with a deep desire to gain power
10) Both were orphaned at a very young age
I think there is a few more but i was too lazy to add on
What do you guys think? You think Kishi reads Harry Potter lol?