Judith in the Judith Bible story is a heroic and devout widow. She was a woman of great courage and faith. She played a crucial role in saving her people from the Assyrian threat.
I don't have enough information to determine exactly who Judith Kay is. She could be an ordinary woman who gets caught up in an extraordinary situation involving the mirror.
The theme of sacrifice is also quite common. Martha sacrifices a lot for Clark, like keeping his secret and protecting him. In many fanfics, this sacrifice is explored in depth, and how it affects both Martha and Clark. There's also the theme of legacy. Martha is passing on a certain legacy to Clark, whether it's the Kent family name or the values of helping others.
Jordan Kent is indeed part of the comics. He often plays a significant role and interacts with other characters to drive the plot forward. His presence adds depth and complexity to the comic universe.