Everyone here has a write-up, drawn from the same records that explain the names while you read the text.
Daniel
Major prophetTaken young into the Babylonian court, Daniel rose by wisdom and unbending faith, refusing the king's food, reading dreams and the writing on Belshazzar's wall, and emerging unharmed from the lions' den. His later visions map the rise and fall of empires to the end.
Nebuchadnezzar
King of BabylonThe Babylonian king who destroyed Jerusalem and its temple and carried Judah into exile. Daniel records his dreams, his furnace, his descent into madness, and his eventual acknowledgment of the God of heaven.
2 Kings 24-25Daniel 1-4
Belshazzar
Ruler of BabylonThe king who threw a feast using vessels looted from the Jerusalem temple and saw a hand write on the plaster. Daniel read it for him: weighed, and found wanting. Babylon fell that night.
Daniel 5
Darius the Mede
Ruler after Babylon's fallThe ruler who reluctantly signed the decree that put Daniel in the lions' den, then spent the night fasting and came running at first light. His identity is one of the standing puzzles of Old Testament history, with proposals including Cyrus himself under another title, or a governor named Gubaru.
Daniel 6Daniel 9:1
Antiochus IV
Seleucid kingThe Greek king who tried to abolish Jewish worship: he outlawed the Sabbath and circumcision, plundered the temple, and set up a pagan altar on it. The revolt that answered him is what Hanukkah remembers. He called himself Epiphanes, meaning God manifest, and his critics called him Epimanes, the madman.
1 Maccabees 12 Maccabees 5-7Daniel 8:9-14
Shadrach, Meshach, and Abednego
The three in the furnaceDaniel's companions, who would not bow to the golden image and told the king that their God was able to save them, but that even if he did not, they still would not bow. The furnace was heated seven times hotter and a fourth figure was seen walking in it.
Daniel 1Daniel 3
Shishak
Foreign kings and their officersThe rulers outside Israel who invade, extract tribute, or grant permission. Shishak of Egypt stripped the temple in Rehoboam's fifth year and left a relief at Karnak listing the towns he took. Necho killed Josiah at Megiddo. Tiglath-pileser III began the Assyrian deportations.
Genesis 14:1-171 Kings 14:25-262 Kings 15:29
Shadrach
The three in the furnaceDaniel's three companions, given Babylonian names in place of their Hebrew ones: Hananiah became Shadrach, Mishael became Meshach, Azariah became Abednego. Their Hebrew names all contain a word for God, and their Babylonian ones honor Babylonian gods, which is the point of renaming captives.
Daniel 1:6-7Daniel 3:8-30Prayer of Azariah 1:1-68
Michael
The named angelsThe only two angels Scripture names. Gabriel appears as a messenger, interpreting Daniel's visions and announcing the births of John and of Jesus. Michael is called a prince and an archangel, and is described contending for Israel.
Daniel 8:16Daniel 10:13-21Luke 1:19-26
Alexander the Great
The Greek conquerorNever named in the Hebrew Bible, but present in it. Daniel's goat from the west with a conspicuous horn, moving so fast it does not touch the ground, and whose horn breaks at the height of its power to be replaced by four, is read across traditions as Alexander and the four generals who divided his empire.
Daniel 8:5-8Daniel 8:21-221 Maccabees 1:1-9
Demetrius
The kings after AlexanderWhen Alexander died his generals carved up the empire, and two of the resulting dynasties fought over Judea for a century and a half: the Ptolemies from Egypt and the Seleucids from Syria. Several kings and generals of both, named Demetrius, Ptolemy, Seleucus, Tryphon, Lysias, and Bacchides, move through the Maccabean books.
Daniel 11:5-201 Maccabees 7:1-251 Maccabees 10:1-21
Cyrus
King of PersiaThe Persian king whose policy was to send captive peoples home with their gods and their temple goods. For Judah that meant the end of exile. Isaiah names him as the LORD's shepherd and anointed, and a clay cylinder in the British Museum records his general policy in his own words.
Isaiah 44:28-45:1Ezra 1:1-4