Dancing Is Serious Business: Not only does it feature into the plot (seriously, you have to win a disco competition at one point, whereupon it's revealed Aleph is damn good at dancing), it is also one of Aleph's most successful demon recruitment options, to the point demons are so impressed how much style he puts into his dancing that that alone will convince them to join on the spot.
Dreadful Musician: Aleph trying to sing will instantly drive demons into incoherent rage, many believing it being an attempt to kill them.
Dude, Where's My Respect?: Averted hard. Being the Messiah tends to make many demons outright terrified to piss you off by the end of the game, and merely namedropping who you are can get them to join you, especially if they are Law aligned.
invokedNeutral Good: Like the first game protagonist, his alignment is set to Light, and regardless of ending, he is ultimately fighting in the name of humanity or what's left of it.
Unresolved Sexual Tension: It's pretty thick between himself and Hiroko, and lots of characters comment on it.
Hiroko
The main heroine of the game, she is initially paired up with him after he becomes a citizen of the Center. However, she decides to go against their will and do whatever you want, and is basically with you for the rest of the game on all alignment paths.
Megaton Punch: Gets a rather amusing version of this in one Demon Negotiation where a demon gives you the choice of having her sing, dance, or Nudge Nudge them for their cooperation, and if you pick option number three, she gets pissed, punches the demon while using a rather amusingly named punch named after herself, and the battle will immediately end with the demon running off.
Parental Incest: Implied in the Neutral ending, where she tells the Hero they have to rebuild the Earth as they walk off into the sunset, which is very similar to what the Heroine of the first game's purpose was. Also, in game, both she and the Hero are shipped together by various characters, and they even have some commented upon Unresolved Sexual Tension.
Stripperiffic: Wears what can be best described as a female templar outfit meets a dominatrix outfit.
Nice Hat: Wears a rather fitting cross patterned head wrap.
Shallow Love Interest: Intended as such in universe. Subverted by the fact she does a genuine Heroic Sacrifice and gives you her soul in death as a powerup.
Four Star Badass: All beings in Makai consider him their archcommander.
Benevolent Boss: As opposed to YHVH, who made Astaroth his personal Butt Monkey, Lucifer gave him a job as one of the leading generals of Makai. Further, Lucifer is pretty laid back, letting his subordinates run their little sections of Makai without much interference, and even Crowley, who is rather mad about not being able to host a Walpurgis Night (due to Lucifer's orders), refuses to speaks ill of him.
Blondes are Evil: Or at least have a contested alignment, unless you are in the Law alignment, which plays this straight.
This trope even lets you tell who is the real Louis Cypher when Astaroth impersonates him.
Took a Level in Kindness: In SMT1 he was the same as YHVH. In this one he is very much interested in seeing humanity survive as he is demonkind. His ending is one of the only times in the series that Chaos actually FEELS like a happy ending, rather than just a world of vice and freedom.
Villains Out Shopping: When not actively planning to screw over God, he can usually be found in the bars across the game, knocking back a drink.
Hypocrite: He betrays the Center for their plotting to eliminate the undesireables in the construction of the Thousand Year Kingdom, but does (or attempts to do) the same thing with the Meggido Ark.
