If you want to succeed as a Neutral Killer, you need to figure out what to claim. I will group a few claims into groups of three ranked from easy to difficult

Easy claims:Chronomancer, Physician, Knight,Court Wizard,Inquisitor,Alchemist and Hunter, These claims are quite easy to make fake logs for. Reapers and Sorcerers also don't have to worry about a Hunter catching them out on being bleed immune if they claim Physician. For Court Wizard make only one swap on night 1/night 2 on people with default names who are unlikely to be visited. If someone asks you to swap either find an excuse not to do it or kill them and hope nobody connects the dots. I would recommend not claiming Knight as its a very obvious claim and is almost cliche. Finally if you want to claim hunter, make sure you are one of the last to claim so you can claim it, but remember you cannot bleed someone so if someone aks you to bleed someone either make up a bleed, or Reap the person who asked you to bleed (very dangerous, you need to be either very cunning or BD needs to be very stupid to get away with this) or Possess someone else and away from suspicion

Moderately difficult claims:Maid,Princess,Sheriff,Paladin,Observer,Noble, With these claims you need to either make up info, or obtain accurate info somehow. Of these claims Maid and Sheriff/Paladin are the easiest to write fake logs for (and therefore most likely to get killed for being suspicious so you will have to work hard to convince others that you are innocent). All you have to be wary of with Maid logs are making sure you dont write royals as compatible, and that you dont have any dead Unseen or Cult as compatible with dead blue dragon since this will get you killed. Princess,Observer and Noble logs are much harder to fake, you will have to either use Puppet Strings to look at whispers if you are the Possessor, or use social deduction and manipulation to get info to make logs. If you choose to claim Princess do not only use information that is already known or the class types of dead people. Or you will most likely get executed

Difficult claims:Drunk, Butler, These claims should only be attempted if you feel very comfortable with making fake logs, or very good at talking your way off the stand. If you want to try claiming Drunk or Butler as the Sorcerer you should ask to be redirected to the king on night 1, place a bomb on a target and detonate. Ideally if there is another drunk they can "confirm" that you are occupy or redirect immune. If you are the Possessor you should consider using Puppet Strings to fake Butler/Drunk logs by stealing redirects/occupies if you want to. Puppet string the prince to someone so you can hear all his whispers the next day and see if anyone claims an occupy/redirect. But if you choose to do this strategy I would recommend claiming Princess as its easier to fake Princess logs

Dont claim: Mystic, Prince, Fool, Sellsword,Scorned. These claims are almost always bad ideas and should never be claimed

It is very important to know how to act during the day. While its important to have good logs, it is more important to act like an innocent member of the Blue Dragon, here's a good checklist

Number 1: Dont be silent. You should be active in day court, During the second day give out your (fake) logs and start a claim train. If you claim an investigative class post all the info you know into chat so you look legit

Number 2: Throw people under the bus. If the court thinks someone else is the Neutral Killer? Provide (fake) evidence that points to them being the Neutral Killer. But dont be too obvious as if they die and are good your head will be on the chopping block

Number 3: Work with outted neutrals. If you're claiming a class like Butler you can work with outed neutrals such as Alchemists and Inquisitors to support your fake claim by saying that you did in fact occupy/redirect them. (Sidenote: Coordinate during the day so your logs both match with each other. Don't expect most neutrals to help you out of the kindness of their heart. Especially if you're on the stand! Be prepared to have to kill the King/Heathens to get help)

Number 4: Find allies. If you can convince an important Blue Dragon such as the Prince or King that you are another Blue Dragon it can avoid you getting hung as people will most likely silence their concerns and think that they were misguided

So this isnt supposed to be a detailed guide. But if you have any questions feel free to PM me so I can add them to the guide?