From r/GabiCult

Falco is arguably my most favorite character out of season 4

It's so painful seeing him realized who Eren was and simultaneously learning about his past and sympathizing with Eren and the Enemy while being torn between his world and theirs.

He is like a young Armin and Eren, it honestly has me so conflicted and sad at times

I'm scared guys. I really like Falco as a character. With Gabi now being a pure Titan, And Falco's promise to save her, I think Isayama might have Falco sacrifice himself to save Gabi by giving her the Jaw Titan. It seems entirely dark and fitting for Isayama's writing, but MAN I really don't want that to happen. Either Gabi could eat Reiner and take the Armoured or everyone becomes normal humans again, but the latter seems very unlikely and Isayama might not kill Reiner at all in chapter 139. I'm so nervous! I think it's a serious possibility that he saves her but I don't want Falco to die. It'd be so tragic.