The Archer: Subverted. He often tries to take sneaky shots at opponents, but sucks at it because of bad aim, bad luck and more importantly, the fact that he has barely leveled his archery skill and plays in high difficulties.
An Axe to Grind: It doesn't take much time before he chooses battleaxes as his favorite type of weapon.
Badass Longcoat: Bob himself wears a red, royal knight/pirate like one when he shows up at conventions where he holds panels.
Berserk Button: He really doesn't like The Empire in his Skyrim playthrough, so when the Riverwood Bard's song Bob jusk asked him to sing, turns out to be about the Imperials... Bob's reactions is quite explosive.
BFS: With his various mods, he manages to craft himself Conan's very sword, and doesn't hesitate to use it, even though Battleaxes are still his favorite weapons.
Blood Knight: He has tendencies to just kill everything around him when provoked, even his own allies during missions along the Stormcloaks.
"Hi, I'm Bob Lennon! Haha!": Opening catchphrase he says everytime he appears in any video. Affectionate Parody of Troy McLure (he even used to say after this "You may remember me from [silly title X] and [silly title Y].").
"Grudu": Doesn't mean anything in particularnote though it is the name of the completely insane barbarian bodyguard in Kaamelott, but is frequently used as some kind of grunt whenever his character is just acting tough. Or sometimes as a substitute to "Hello".
"Cuir, cuir, cuir, moustache!" (Leather, leather, leather, mustache): Used everything anything exceedingly manly happens, especially if it has homosexual overtones, such as, well, a manly man wearing leather. Currently replaced by a running gag about pinching one's nipples for "ninja training".
"I love my job!": Whenever he gets to brutally kill foes or annoying NPCs without consequences.
"This is completely muteki!": Every time he comes across, or even crafts a ridiculously powerful item. Has many variants, such as "mutepic", "permacheat" and "permacrack".
"Fabulouuuus!": When he meets something or someone highly effeminate, like Sergei in Asura's Wrath.
Content Warnings: Bob is partially known for his attitude involving a lot of swearing. He has receive some complaints from mothers about it, but answers that it is their responsability to control what their children are watching, highlighting that he is partly playing M-rated games.
But he likes and respect his younger audiance, and states this is why he will never play really scary games on his channel, like the Fatal Frame franchise.
Cuteness Proximity: His fondness for cats makes him d'aaaaw and squee all over the place whenever he sees Khaajits. When Kharjo is his companion, he occasionally notes how cute he is, even when wearing heavy armor, a sword and a shield.
He eventually loses it when he comes across a Khajiit orphan, courtesy of a mod.
Also used to scare Biloulette when she plays Amnesia.
Failed a Spot Check: In the first episodes of the Playthrough, Bob seems to miss or downright ignore a lot details, leading him to die a few stupid deaths, get lost when the right path was right in front of his face, or taking an immense amount of time looking for clues everywhere for a puzzle, when he's got a book that basically tells him what to do.
Nowadays, he still seems unable to grasp how the on-screen compass/radar works. He has no trouble noticing the red dots indicating enemies, but he apparently cannot see the destination markers, often running a few hundred meters in what he believes to be the right direction, while the marker isn't even remotely close to the center.
Full Frontal Assault: Mostly in Tenchu Z, but also in Skyrim and Saints Row III (in fact everytime there is a Character Customization menu). He call himself in these occasions the "Nudist Ninja", stating that a real ninja doesn't need any clothes (because nobody can see him) and it also is the supreme humiliation for his opponents.
"Just imagine you're a guard, and you know there's a deadly ninja assassin who's coming for you. You hear a sound behind you, you turn back... nothing. But you know he's there somewhere, and you heard the rumor this guy is a nudist, but you can't verify it. And the only way you could discover the truth is the time your decapitated head rolling on the ground sees him, and your final though is 'My God! It really was a nudist'."
Game Mod: He mods his game quite a lot, even though he initally promised to play it normally, in order to show what the game actually is like to people who don't have it. His game is currently heavily modded graphically, has various tweaks and contains a lot more items than normal.
Glass Cannon: His love for "barbarian" armor, as in fur and leather, makes him very vulnerable since these are some of the weakest types of armor. He still carries a big axe and likes to cast fire spells around.
Gratuitous English: By inserting English words in his French phrases, such as "full", "bullshit" and "doom". He has a decent English level, but sometimes uses it a bit off context.
Make Me Wanna Shout: Of course, considering the game he's playing. That and all the mods he installed to change/enhance his shouts. He has a great tendency to Fus Ro Dah people away when they annoy him and he can't afford to go on a killing spree. In his latest episodes, he made the Fus Ro Dah ridiculously powerful and can pretty much scream his victims into orbit when there isn't a ceiling in the way. Becomes hilarious when he blasts Kodlak Whitemane into the sky for criticising his sword, and sees him pinball out of sight when hitting the border of the skybox.
Ninja: He tries to be one during the whole five and a half hours of his 200th episode special, since he spends the entire session going throught the Dark Brotherhood's questline. He isn't exactly good at being sneaky, but still manages some antics with his gear mods and overpowered enchantments, effectively turning him into a poor man's (and hilarious) Ryu Hayabusa.
Playing with Fire: While his character is not exactly a mage, he's still a Pyro-Barbarian. His magic generally sucks against anything else than low-level bandits or wild animals, tough.
Rapid-Fire Comedy: He makes an almost unending chain of over the top reactions, warcries and improvised jokes about the game.
Rapid Fire No: During Leon's campaign in Resident Evil 6, Bob (as Helena) got caught by a monster who tried to push him in a grinder. After an epic QTE battle, he fight off the monster, but did not expect a second QTE. Bloody ending ensues.
Robot Me: Bot Lennon, a robotic version of himself used in a trailer for the Minefield server.
The Scrappy: Calder, In-Universe. He really doesn't like this guy and never really gave him a chance to be useful, only taking him along once for fun, as well as Lydia and Kharjo, courtesy of a mod allowing him to have more than one ally at a time. Nowadays, he just sits in his home at Lakeview Manor, posing as a robot butler in Dwemer Armor renamed Unity C4LD3R.
Take a Third Option: During the quest "In My Time of Need", the player has to side with Saadia or with the Alik'rs, with no clues of who is telling the truth. Bob kills both Saadia and Kematu (the Alik'r's leader).
This caused a bug which makes remain the two Alik'r warriors which gave the quest to Bob. They particularly annoy him, who cannot kill them without draw the guards.
That's What She Said: When Fanta (or anyone) makes himself an easy target. He add "to you" or "to me" depending of the context (what Minecraft, which includes digging, offers a lot).
Though Bob doesn't really use this joke anymore. It is even Fanta who said that now.
Uranus Is Showing: Kind of. Lampshaded in Asura's Wrath when he receives an "A" rank for his time then a "S" for the two others ranks. He is disapointed if he doesn't manage to have it, even when he gets a perfect "SSS" score.
Would Hit a Girl: Since female opponents are pretty much as frequent as men, he doesn't really care. But he also has no qualms about Fus Ro Dah-ing his wife.
Wrestler in All of Us: Since he made weaponless combat more reliable with the help of mods, and also made executions more frequent, he takes great pleasure in bodyslamming/german suplexing fools.
Wrongfully Attributed: Bob is oftenly quoting some of his favorite Internet celebrities, including StateAlchemist, creator of Saint Seiya Abridged. But being now more popular than this abridged series, some of the quotes and voice impersonations he does are attributed to him, even causing some ignorants Bob fans to accuse StateAlchemist of plagiarism. But State is not mad at Bob for this, and even made a special video for his anniversary.
"No! Not the infernal and filled with germs depths of oblivion!"