in Book 1, he he gives Mother Malkin the cakes that give her the strenght to escape; in his defense, he was tricked by Alice and Lizzie.
in Book 2, he actually averts the Trope by refusing to free the Bane, only to have Alice doing it instead of him.
in Book 4, Mab and the Moudheels were actually refusing to help the other Witch Clans to summon the Devil, until Tom double-crossed Mab and rejected her. Once again, in her defense, she had threatened his family a few minutes ago.
Time Master: he got it from his mother. Though he can only stop time at best, and he only learns to use right it starting with Book 8.
Took a Level in Badass: In the initial books, he would often end up as a Distressed Dude and survive only thanks to running away, cunning, luck or help from an Alice and Gregory. By the end of Book 8, he almost fully masters his Time Stands Still ability and learnt how to use the Sword of Destiny from Grimalkin. In Book 10, he actually manages to easily defeat a Strigoi in a straight fight. Twice.
Undying Loyalty: in spite of all the times he disobeyed to Gregory, Tom is devoted to him and would never betray him.
The Atoner: she is clearly trying to make up for the horrors she did back when she was on the side of the Dark.
Becoming the Mask: Though she genuinely wanted to turn good from the beginning, and did feel grateful to John Ward for saving her, she initially had no feeling for him and only chose to become his wife so she could give birth to the Seventh Son of a Seventh Son. After marrying him, though, she gradually learnt to love him for real over the years.
A friendly Boggart Gregory allows to stay in his house, fonctionning both as a guardian, cook and housekeeper.
Attention Whore: Sort of; it doesn't exactly tries to get people attention, but it sure enjoys it. Gregory quickly teaches Tom to regularly thank and compliment it for the meals it prepares in order to get on its good side.
Badass: Though it severely injured and weakened it, it still managed to kept the Bane in check when he tried to attack Gregory's house.
Bargain With the Boggart: Gregory made a deal with it, allowing it to stay at his house and consider it it's territory. In exchange, it has to take care of the house for him, prepare food and protect the house from potential intruders.
It makes a new one with Tom in Book 10, which uses the same terms, plus one addition: whenever Tom is in danger, he can summon it by calling it name thrice, causing it to arrive, kill all his enemies and feed on their blood.
Battle Butler: To Gregory. An invisible and supernatural one, sure, but he pretty much assumes the same role.
Cats Are Magic: The Boggart doesn't really have a tangible form, being more of a spirit than an actual living being, but whenever it manifests itself, it usually appears as a red-furred cat. It also typically express itself with cat noises.
Crippling Overspecialization: Presumably the reason he is not considered a completely worthy heir to Gregory: he is a pretty good Spook, but he specializes in dealing with Water Witches mainly, and isn't as good as Gregory for other kinds of treath.
Drill Sergeant Nasty: his training of Tom is much more violent than Gregory's, borderline cruelty at some points; justified in that he is suffering acoholism due to the fate of his family. As the story goes on, he gets better.
Fatal Flaw: his alcoholism; subverted in that he still survives despite it eventually;
Did You Just Slept With The Fiend ?: she did have a child with the Devil as a part of her plan to make sure he would never be able to hurt her (the Devil can never approach a mother of one of his children unless she wants it). This backfired as her child turned out to be normal, causing the Devil to kill him. Since them, Grimalkin pretty much wants the Devil's skin.
She also dislikes gratuitious murder, ironically precisely because she is an assassin: since she takes life as her job, she can see how pointless murdering someone for no reason can be. In I Am Grimalkin, she decides to spare some random man she just forced to transport her, seeing how he doesn't represent a treath to her.
Punch Clock Villain: in her first appearance only: she had no specific grudge against Tom, she was just chasing him because her clan ordered her so. After that, she sides with the good guys in all her appearances.
Slasher Smile: and an especially creepy one, given she has pointed teeth.
Sociopathic Hero:In later books; She is just as violent as any bad witch, her methods to deal with enemies are gruesome and she clearly enjoys violence, but she is fighting on the protagonists' side.
Axe Crazy: There are some exceptions, but for the most part, they are all psychotic, sadistic and cruel.
Back from the Dead: Whenever a witch is killed, she can resurrect either through reincarnation (which usually takes a long time to happen) or as an undead corpse that will gradually decay over time. There are only three ways to prevent this from happening: not killing the witch and keep her sealed alive in a pit; burn her body; or have her heart be eaten.
Not-So-Harmless Villain: when she first shows up, she is not exactly harmless, but still few more than a minor villain intending to bring back Mother Malkin, and is quickly dealt with by Gregory when she confronts him. When she comes back in Book seven, she kills the book's main villain and takes over, and proves to have grown strong enough to defeat Gregory by her mere will.
Bad Boss: In I Am Grimalkin, Grimalkin teases his servants by torturing and mutilating his head right in front of them. His reaction is to curse his servants for failing to save him from that and swear he will torture them after their death.
Evil Is Not a Toy: Almost subverted; the witches were perfectly aware of how uncontrollable the Fiend would be if he ended up coming in their world, and a lot of them were initially reluctant to summon him. It took Mistress Wulmalde's leadership to convince them.
For the Evulz: When asked by Grimalkin why he killed her son, this is more or less the answer he gives.
Humiliation Conga: After he has been sealed by Tom and the Spook, Grimalkin ends up in charge of keeping his head. She takes advantages on the situation to constantly torture, mock and tease him, at one point even mutilating him right in front of his own servants.
Off with His Head!: how Tom, Gregory and Grimalkin are eventually able to temporary neutralize him and seal him.
Orcus on His Throne: Completely averted; he is more than willing to just go after Tom and kill him while he is still too weak to oppose him. The only reason he hasn't done it yet is because his mother and later Alice both put wards on the boy to protect him.
Pragmatic Villainy: he kept his word to free Bill Arkwright's family in his bet with Tom, even though he could have easily played on Exact Words to not keep his part of the bargain. The only reason he did it was because it was part of a Batman Gambit to have Bill Arkwright indebted in Tom and convincing Gregory to let Alice go.
We Can Rule Together: Justified; according to the Ward Tom's mother put on him, it'll be much more profitable for him if Tom is corrupted.
Cruel and Unusual Death: he inflicts this to his victim through his trademark abilitie to crush them by augmenting his weight. The result is dowright disgusting.
Deal with the Devil: offers this to his victims; in exchange for them letting him drink a small portion of her blood, he grants them three wishes. He is always forced to always keep his part of the bargain, but each time a wish is granted, he gradually takes control of the person.
Immortals Fear Death: Since he is not human, there is nothing after death for him. As a result, he is absolutely terrified by the perspective of dying.
Out-Gambitted: twice; once in the past, which led to his original imprisonment; and the second time by Alice.
Politically Incorrect Villain: while the Bane is scared of women, he makes it quite clear he has a low opinion of them, indicating at some point that he believes their wishes are much easier than men (basically, he think a woman will typically wish for new clothes or other similar things). This bits him hard in the arses when he underestimates Alice because of this.
Animalistic Abomination: His cultists summon him to possess a goat, creating one of those. Though as we later find out, he is not happy about it.
Bargain with Heaven: Makes one with Tom to avoid his forced possession of a goat, saving Tom's life in the process.
Benevolent Genie: During his bargain with Tom, Tom asks him to save Alice from the Fiend. Pan answers he can't do this at this point, since even he can't go safely in the Fiend's realm. Later in the book, the Devil is binded, leaving his realm easier to access, and Pan seizes the opportunity to free Alice for Tom, even though at this point nothing forced him to keep this part of the bargain.
Good All Along: He initially is introduced as yet another evil god worshipped and summoned by sorcerers in the form of an Animalistic Abomination. Around the middle of the book, we learn he actually dislikes what the cultists do with him, and has no control over his action when he is summoned. He then makes a bargain with Tom to not avoid said summoning.
Luke, You Are My Father: subverted; he pretended to be Gregory's son to Tom, playing on the fact his mother used to be Gregory's first mistress. In truth, her relationship with Gregory was short-lived, and she ended up marrying another man who was also the Seventh Son of a Seventh Son but not a Spook. It is strongly hinted however that Morgan has come to believe his own lie.