Traditionally in history, some great hackers have been motivated enough to change the world or improve it, and let no obstacle permanently stop them. They have become so powerful that they took over the direction of the world and together with some collaborators and supporters became sources of greatness. This is even though some of them were clearly or presumably fictional.
We'll call them the "Hacker Monarchs" ("Hacker Kings" / "Hacker Queens") which is a less loaded title than "Messiahs".
We are still figuring out more and more guidelines for how a hacker monarch should behave, and likely there'll be future insights.
In the article about the Grand Nagus in Star Trek DS9, Quark is quoted as saying:
Oh believe me, the Nagus has the greatest business mind in the entire Ferengi Alliance, always thinking ten, sometimes twenty steps ahead of everyone else.
and this is similar for a hacker monarch who is often ahead of the curve. A messiah also attempts to always think a few steps ahead.
A hacker monarch believes that the correct answer to the question "Who is the most powerful person on Earth?" is "I am". Furthermore, the only less powerful people are those who answer otherwise.
They also know they can improve themselves, improve the world at large, and enjoy themselves — all at the same time.
In addition, a hacker monarch wishes no man or woman to unnecessarily suffer or die prematurely and from unnatural causes. They also want every person and collective to improve and become better (= the Pygmalion effect as opposed to the Golem effect).
A hacker monarch is “their brothers’ keeper” to paraphrase on the Cain and Abel myth. For example Christina Grimmie has tried to adapt herself and her work to what she thought others wanted for several years before her assassination at age 22 (by a fan who killed himself later almost immediately). While it was ultimately her fault, she had many fans and viewers and friends who could have noticed (including I).