Sigrun and Tanith are two characters who both appear in Fire Emblem: Path of Radiance and Fire Emblem: Radiant Dawn. Tanith is a playable character in both games while Sigrun is an NPC in the former and a playable character in the latter. Both serve Empress Sanaki of Begnion and act as her caretaker and guardians. Fans have read the two as queer, but they sadly have no support conversations or paired endings to provide further insight into their relationship outside of their screen-time in-game.
Both also appear in Fire Emblem Heroes (the top two in the picture above), notably with Bridal alternate skins. Fans have read this to be hinting at their relationship, as two other characters included in the banner, Louise and Pent, are a couple. However, they both have no dialogue that references the other explicitly.
Because of this, we have classified them as Queerly Rumored/Read.
LGBTQ references in this game series:
Fire Emblem: Thracia 776 (1999): Marty and Dagdar
See also QRM’s entry for this game series