Why does Tobi call Deidara Senpai?

Answer 1

because Tobi respects Deidara as he is of a higher rank."Senpai" means senior in english.

Answer 2

Kakuzo is not Sasori. Sasori is a puppetmaster, but when Sasori is under his disguise, I guess you can say he looks like Kakuzo.

Answer 3

Most people think it’s because senpai can also mean respecting your elder’s bla blah, and it’s probably true, but I like to think of it as Tobi liking Deidara! But it’s just my opinion, I don’t have any reasons to think that other than because I like gay ships, but there was a time in an episode where Tobi pretended to be a high school girl watching their “Senpai“ lol

Answer 4

He is gay

Answer 5

Senpai ne veut pas dire qu'on aime la personne en amour, mais juste qu'on l'apprécie. C'est souvent utilisé pour parler d'un aîné, comme Yamato qui appelle Kakashi "senpai"