Kayin wanted what was not his, and so he lost even what he had: Sotah 9b
Methuselah
Methuselah as one of the 7 "Shepherds" - King David, flanked on the right by Adam, Shet and Methuselah, and on the left by Avraham, Yaakov and Moshe: Succah 52b
Noah
Who are considered his descendants: Nedarim 31a
Gd states only part of Noah's glory to him, but praises him more highly when speaking about him in his absence; this avoids the appearance of flattery: Eruvin 18b
The dove took an olive branch in order to show its preference for bitter food from Gd, over sweet food from flesh and blood: Eruvin 18b
Og, King of Bashan
As a Giant, vis-a-vis threshold measurements for transgressions: Yoma 80b
Shem
Shem as the person known as "Malki Tzedek": Nedarim 32b The Messiah from David, the Messiah from Joseph, Eliyahu and Shem ["The Righteous Kohen"] as the 4 foundations of the Redemption: Succah 52b
Avraham getting the right to have the Kohanimdescend from him instead of from Shem / Malki Tzedek, when Shem blessed Avraham before thanking Gd after the war with the Kings: Nedarim 32b
The case of Tamar was tried in the court of Shem: Makkot 23b
Shet
Shet as one of the 7 "Shepherds" - King David, flanked on the right by Adam, Shet and Methuselah, and on the left by Avraham, Yaakov and Moses: Succah 52b
Whether the Flood began on the 17th of Cheshvan or of Iyyar: Rosh HaShanah 11b-12a
Gd changing the constellations to cause the Flood: Rosh HaShanah 11b-12a
Height of the Water: Yoma 76a
Humans died before animals did: Eruvin 18a
Whether the fish were punished, too: Kiddushin 13a
The water was boiling hot: Rosh HaShanah 12a
The dead flowed to Bavel: Shabbat 113b
The "Rainbow" was Created on Day 6, at Sunset: Pesachim 54a