Not really in any order but Kakashi/Itachi/Naruto/Shikamaru/Gaara/Tobirama.
Kakashi-He's cool, easygoing attitude, not too OP, strategic
Itachi-He's a real shinobi, intelligent, badass, not arrogant like all the other Uchihas which is a breath of fresh air if you ask me
Naruto-I usually don't like loud characters because they annoy me, but I don't find Naruto bothersome at all. He's entertaining and I like his "Never giving up" attitude, even if it can sound a little cheesy at times.
Shikamaru-One of the few people in the series who do not rely on powerful techs to win a fight, smart, I like the way his lazy attitude contrasts with his high level of intellect
Gaara-He's come quite far and he has some pretty great character development
Tobirama-I like his no-nonsense attitude, intelligent, he created the justu the main character and his father use
Honorable mentions are Kisame, Deidara, and Sasori.