Hanta Sero/Relationships

Eijiro Kirishima
They are good friends with each other. Hanta and Eijiro were on the same team during the cavalry battle, along with Mina and Katsuki. Hanta and Eijiro work well together, as noted by how they cooperated in reeling in Katsuki during said cavalry battle.

Denki Kaminari
Kaminari and Sero appear to be good friends, often hanging around and talking to each other, indicating a friendship. They share a very easygoing and social personality, tending to be among some of the louder and more extroverted boys of the class. The enjoy making jokes with each other, and appear to be very comfortable around one another.

Katsuki Bakugo
Hanta and Katsuki tend to be in close proximity due to their friendships with Eijiro. They were in the same team during the cavalry battle, where it was demonstrated that Hanta often gets exasperated with Katsuki's extreme competitiveness but is willing to cooperate with him regardless. Katsuki refers to him as "Tape Arms" or "Soy Sauce Face."

Minoru Mineta
Hanta is often seen chastising Minoru for his perverse actions though they get along as well.

They were paired up in their exam against Midnight and Hanta used his tape to get Minoru away from Midnight's quirk, leaving Hanta himself susceptible and thus incapacitated. However, due to Hanta's actions, Minoru was able to best Midnight and get him and Hanta through the exit.