Last weekend when The Eternals footage debuted at CCXP 2019, fan theories of Ikaris being the promised gay character were dashed as the convention revealed that Ikaris is in a relationship with Sersi in the movie; potentially setting up a MCU love triangle with Black Knight.
Now an alleged description of the footage has surfaced, and it identifies who the gay character is in the movie.
According to a poster on Box Office Theory, Phastos is the character married with children in the film:
“We see Phastos, with civil costumes, in the company of two childrens and another guy, holding hands.”
A user on Reddit asked the poster for more details on the footage, and what he said lines up with what others described in the footage; although this is the first we’ve heard about the shot of Phastos with two children.