I find it very likely that Tserri is Beyond's child after this chapter.
His ponytail looks resembling Netero, his pose, his hyper fixation on being the very best he can be, these can't just be coincidences.
There's also the fact that Tserri doesn't have the trademark Unma nose which could be another hint.
And the fact that he's been set up as this sort of ultimate threat that is at the heart of the narrative for several characters, it just feels too fitting and I don't think it's characteristic of Togashi to throw a big curveball for cheap shock value.
Tserri might be the obvious pick, but in terms of stylistic similarities and thematic implications, it works wonders and I vastly value that.