Riki Ryugasaki - Riki thinks Samuru is a cool and reserved guy. Samuru thinks that Riki may surpass him one day so accept him as rival. After knowing he is a crossfire competitor, Riki thinks Samuru is mysteries just like Crossfire so if he ask him, he may be can know more about the b-animals and Crossfire. Later defeating Novu, their relationships have been closer all most like brothers. In Cross Fight B-Daman eS, Yuki and Simon said that Riki and Samuru are soulmates, they will take what ever to fight against each others which made Kamon jealous.
Reggie Mak - Their relationship doesn't seem clearly enough because that time Samuru doesn't open up to anyone yet and Reggie thinks him as a rival. After Novu's defeat, they had become more closer friends, and Reggie also reports new information for him either about Dragold.
Basara Kurochi - Samuru first see him as a enemy but after Dragold's revived, he gives Basara advice that cannot use any special moves in the battle between Dragold but Basara ignored it. When Basara helped Riki and him battle Dragold, he puts his guard down for him then in the new season , Samuru still distant himself from him but later he still advised him to don't let his guard down while in the B-Master Battle.
Novu Moru - Samuru doesn't trust Novu, seeing his suspicious moves, he started to spying on him. After knowing his plan, he exposed his plan to Riki and WBMA. After Novu's defeat, he became more closer to Riki. In B-Daman Fireblast, he and Novu's relationship may be closer but Samuru still have no trust in Novu.
Yuki Washimura - Yuki claimed himself that he's a friend to Samuru in Fireblast, well is but not very close.
Kamon Day - Kamon always think of Samuru will he come to any tournaments, he usually get along well with him than Riki.
Misuru Hachuka - Samuru looks closely to Misuru, after he lose to him. He used him to hear more information about Crestland and Road Fight. When he hears the conversation between Misuru and Agent Chaos, he try to make Misuru to take rid off the mind of taking Garuburn.