These are little visualizations based on the text and annotations of the Digital Tolkien Project.

Shortest Paragraph in The Silmarillion “Who are you?” said Túrin. J.R.R. Tolkien, Silmarillion [S QS.21.055] Little Delving #0021 digitaltolkien.com
Shortest Paragraph in The Lord of the Rings “Nothing.” J.R.R. Tolkien, Lord of the Rings [LR 4.10.054] Little Delving #0020 digitaltolkien.com
Shortest Paragraph in The Hobbit “Why?” J.R.R. Tolkien, The Hobbit [H 01.108] Little Delving #0019 digitaltolkien.com
“dark” versus “light” frequency per 10k tokens The Hobbit: dark 14.77 light 12.25 The Lord of the Rings: dark 15.35 light 11.4 The Silmarillion: dark 12.45 light 11.61 Little Delving #0018 digitaltolkien.com
Longest Paragraph in The Silmarillion For nigh on two years after the Dagor Bragollach the Noldor still defended the western pass about the sources of Sirion, for the power of Ulmo was in that water, and Minas Tirith withstood the Orcs. But at length, after the fall of Fingolfin, Sauron, greatest and most terrible of the servants of Morgoth, who in the Sindarin tongue was named Gorthaur, came against Orodreth, the warden of the tower upon Tol Sirion. Sauron was become now a sorcerer of dreadful power ... J.R.R. Tolkien, Silmarillion [S QS.18.016] Little Delving #0017 digitaltolkien.com
Distribution of Words Per Paragraph in The Silmarillion Histogram showing number of paragraphs with a given number of words. The longest paragraph is QS.18.016 with 481 words. Little Delving #0016 digitaltolkien.com
Mentions of ‘Black Gate’ vs ‘Morannon’ by book of Lord of the Rings Bar chart Book 1: Black Gate 0 ‘Morannon’ 0 Book 2: Black Gate 2 ‘Morannon’ 0 Book 3: Black Gate 0 ‘Morannon’ 0 Book 4: Black Gate 7 ‘Morannon’ 7 Book 5: Black Gate 9 ‘Morannon’ 5 Book 6: Black Gate 6 ‘Morannon’ 1 Little Delving #0015 digitaltolkien.com
Mentions of ‘precious’ by book of Lord of the Rings Bar chart Book 1: 12 times Book 2: 3 times Book 3: 11 times Book 4: 87 times Book 5: 1 time Book 6: 20 times Little Delving #0014 digitaltolkien.com
Longest Paragraph in The Lord of the Rings Strider sighed and paused before he spoke again. That is a song, he said, in the mode that is called ann-thennath among the Elves, but is hard to render in our Common Speech, and this is but a rough echo of it. ... J.R.R. Tolkien, Lord of the Rings [LR 1.11.148] Little Delving #0013 digitaltolkien.com
Distribution of Words Per Paragraph in The Lord of the Rings Histogram showing number of paragraphs with a given number of words. The longest paragraph is 1.11.148 with 483 words. Little Delving #0012 digitaltolkien.com
“evil” versus “good” frequency per 10k tokens The Hobbit: evil 1.26 good 18.22 The Lord of the Rings: evil 5.2 good 9.4 The Silmarillion: evil 11.14 good 2.38 Little Delving #0011 digitaltolkien.com
Mentions of ‘Gollum’ vs ‘Sméagol’ by book of Lord of the Rings Bar chart Book 1: Gollum 30 Sméagol 8 Book 2: Gollum 23 Sméagol 1 Book 3: Gollum 4 Sméagol 0 Book 4: Gollum 308 Sméagol 141 Book 5: Gollum 2 Sméagol 0 Book 6: Gollum 18 Sméagol 2 Little Delving #0010 digitaltolkien.com
Chunks per Chapter in The Hobbit Bar chart with 19 bars, one for each chapter of The Hobbit. Little Delving #0009 digitaltolkien.com
“do not” versus “don’t” frequency per 10k tokens The Hobbit: do not 0.94, don’t 12.88 The Lord of the Rings: do not 9.25, don’t 8.83 The Silmarillion: do not 1.38, don’t 0 Little Delving #0008 digitaltolkien.com
Mentions of ‘Shire’, ‘Rohan’, and ’Gondor’ by book of Lord of the Rings Bar chart showing counts of Shire, Rohan, and Gondor for each book. Counts for Shire by book are 123, 47, 5, 12, 17, 54. Counts for Rohan by book are 0, 23, 74, 7, 70, 29. Counts for Gondor by book are 0, 32, 34, 43, 113, 38. Little Delving #0007 digitaltolkien.com
Longest Paragraph in The Hobbit Undoubtedly that was what brought the dragon. Dragons steal gold and jewels, you know, from men and elves and dwarves, wherever they can find them; and they guard their plunder as long as they live (which is practically for ever, unless they are killed), and never enjoy a brass ring of it. Indeed they hardly know a good bit of work from a bad, though they usually have a good notion of the current market value; and they can’t make a thing for themselves, not even mend a little loose scale of their armour. There were lots of dragons in the North in those days, and gold was probably getting scarce up there, with the dwarves flying south or getting killed, and all the general waste and destruction that dragons make going from bad to worse. There was a most specially greedy, strong and wicked worm called Smaug. One day he flew up into the air and came south. The first we heard of it was a noise like a hurricane coming from the North, and the pine-trees on the Mountain creaking and cracking in the wind. Some of the dwarves who happened to be outside (I was one luckily—a fine adventurous lad in those days, always wandering about, and it saved my life that day)—well, from a good way off we saw the dragon settle on our mountain in a spout of flame. Then he came down the slopes and when he reached the woods they all went up in fire. By that time all the bells were ringing in Dale and the warriors were arming. The dwarves rushed out of their great gate; but there was the dragon waiting for them. None escaped that way. The river rushed up in steam and a fog fell on Dale, and in the fog the dragon came on them and destroyed most of the warriors—the usual unhappy story, it was only too common in those days. Then he went back and crept in through the Front Gate and routed out all the halls, and lanes, and tunnels, alleys, cellars, mansions and passages. After that there were no dwarves left alive inside, and he took all their wealth for himself. Probably, for that is the dragons’ way, he has piled it all up in a great heap far inside, and sleeps on it for a bed. Later he used to crawl out of the great gate and come by night to Dale, and carry away people, especially maidens, to eat, until Dale was ruined, and all the people dead or gone. What goes on there now I don’t know for certain, but I don’t suppose any one lives nearer to the Mountain than the far edge of the Long Lake now-a-days. J.R.R. Tolkien, The Hobbit [H 01.123] Little Delving #0006 digitaltolkien.com
Distribution of Words Per Paragraph in The Hobbit Histogram showing number of paragraphs with a given number of words. The longest paragraph is 01.123 with 462 words. Little Delving #0005 digitaltolkien.com
Mentions of ‘Strider’ vs ‘Aragorn’ by book of Lord of the Rings Bar chart Strider is far more frequent in book 1. Aragorn is more frequent in books 2, 3, 5 and, to a lesser extent, 6. Little Delving #0004 digitaltolkien.com
March 25, T.A. 3021 Birth of Elanor the Fair, daughter of Samwise. On this day the Fourth Age began in the reckoning of Gondor. J.R.R. Tolkien, Lord of the Rings, Tale of Years [LR B.TA.3021.03.25] Little Delving #0003 digitaltolkien.com
“war” versus “peace” frequency per 10k tokens The Hobbit: war 1.15, peace 0.73 The Lord of the Rings: war 4.18, peace 2.15 The Silmarillion: war 7.76, peace 3.92 Little Delving #0002 digitaltolkien.com
March 25, T.A. 3019 The Host is surrounded on the Slag-hills. Frodo and Samwise reach the Sammath Naur. Gollum seizes the Ring and falls in the Cracks of Doom. Downfall of Barad-dûr and passing of Sauron. J.R.R. Tolkien, Lord of the Rings, Tale of Years [LR B.TA.3019.03.25] Little Delving #0001 digitaltolkien.com