Deku: "I won't ever forget."
Shigaraki's name unmentioned in 428
Freshman congrats Deku on being inspiring (when killing Shigaraki); Deku, despite remembering Spinner's glare, stammers out an "Oh...okay..."
Last time he ever speaks Shigaraki's name: 429
In the context of "well we just have to try keep reaching out!"
430 - No mention of Shigaraki's name, or the League's name
Deku thinks of Shigaraki's "that depends on what you do tomorrow" re: destruction for the beginning of his closing narration
No change to Hero Society except things inexplicably are sorta better and villain rates are down
Shigaraki shows up as one ghost panel when Deku gets his Hero suit (built on the data from All Might burning through billions of yen/dollars to beat down child All For One) and can be a hero again
When his last act as Hero with the power All Might gave him was... killing Shigaraki
a few months later, in Chapter 431
Vague Tenko flashback as he talks about liking/keeping being a teacher and giving lectures at schools and facilities
Tenko moment is specifically during the Shimura family massacre when family generational trauma and dysfunction/abuse, and also One Big Evil Dude's scheme, caused Tenko to snap
At least Uraraka is trying to screen for family abuse using a weeks long program come on
Uraraka mentions Toga's name; Shouto mentions Touya's name.
Deku makes no mention of Shigaraki.
Last flashback of Shigaraki saying "do your best (to keep my destruction of hero society)" is used to propel him to ask Uraraka out.
Chapter 431.5, that five page Eri/UA oneshot in the final databook
News excitedly talking about Deku being a Hero again and being No. 4 (on the billboard chart that was not abolished but instead expanded) after losing his power since 'that day' (the day he killed Shigaraki)
Everyone talks about how inspiring Deku is
