Abraham Carter/Relationships

Ikki Kurogane
Though Abraham never met Ikki in person, he was interested in him after witnessing him deny his fate as an F-Rank and even become a witness to him acheving his awakening and becoming a desperado like him.

Arthur Bright
Though not much about them has been revealed, both appear to be rivals as Abraham and Arthur are among the Three Top Blazers in the World. This could be shown as Union and the League had a war against one another in the Baltic Crisis in the neutral country of Estonia after both sides invaded it.

Tyrant
As one of the Three Top Blazers who has split the world into three parts alongside Arthur, Abraham views Tyrant as one of his main rivals for supremacy.

Kouzou Kazamatsuri
In their initial meeting, Abraham never showed direct hostility toward Kouzou, instead, he questioned him where his loyalty stands as allies or enemies.