This is Kunio's greatest rival, Riki. And these are the male characters who are similar to him.
Kazuma Kuwabara (Yu Yu Hakusho)
Ken (Street Fighter series)
Jimmy Lee (Double Dragon series)
Piccolo (Dragon Ball franchise)
Vegeta (Dragon Ball franchise)
Sasuke Uchiha (Naruto franchise)
Knuckles the Echidna (Sonic the Hedgehog series)
Proto Man (Mega Man classic series)
Patrick Star (SpongeBob Squarepants)
Josuke Higashikata (Jojo's Bizzare Adventure Part 4)
Han Solo (Star Wars original trilogy)
Anakin Skywalker (Star Wars prequel trilogy)
Wolverine (Marvel Universe)
Jacky Bryant (Virtua Fighter series)
Sub-Zero (Mortal Kombat series)
Raphael (Teenage Mutant Ninja Turtles franchise)
Taishi Ci (Romance of the Three Kingdoms/Dynasty Warriors series)
Ma Chao (Romance of the Three Kingdoms/Dynasty Warriors series)
Matt Ishida (Digimon franchise)
Ironhide (Transformers G1)
Buzz Lightyear (Toy Story franchise)
Robert Baxter (Time Crisis II)
Buttercup (The Powerpuff Girls franchise)
Katsuki Bakugo (My Hero Academia)
Kung Lao (Mortal Kombat series)
Ren Akiyama/Kamen Rider Knight (Kamen Rider Ryuki)
Jowy Atreides (Suikoden II)
Harry Dunne (Dumb and Dumber franchise)
Amity Blight (The Owl House)
Thyme (High Guardian Spice)