These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
For being mentioned in all of one line, Methuselah is the subject of a lot of extra-biblical stuff.
Nimrod is amazingly popular in folklore (the Tower of Babel was apparently built on his orders and he tried to have Abraham killed) and pop culture (shares the name as a villain from The X-Men).
What Do You Mean, It's Not Didactic?: Besides the creation story (no, we are not going to open that can of worms here), there is Melchizedek, the High Priest who gave Abraham and Sarah bread, wine, and a blessing in the name of their God. Some uphold him as a metaphor or foreshadowing of Christ, others just see him as some priest-king-dude who did something nice for Abraham and Sarah.