My new name doesn't have a middle name yet, so I'm accepting suggestions on what I could adopt that'd break as many systems as possible.

Obvious answers:
* null
* an emoji
* U+FFFD �
* half of a unicode surrogate pair
* EICAR
* some kind of prompt injection
* the entirety of DOOM, base64 encoded
* an illegal prime
* the source to decss
* 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

@foone NMN (to be, the value, "no middle name")
@arrjay @foone I know a number of people whose first name is, so far as the US Government is concerned, FNU ("First Name Unknown") because they have only one name but paperwork demands at least two
@ricci @arrjay That's basically what my first name was anyway, FNU Turing! :)