Here is a link to the MA I'm currently building. It's not the most OP it can get (that kind of MA is a bit of a glass cannon), because it sacrifices brute (magickal) strength in favor of more points put into physical attack (for daggers), physical defense, HP, and stamina. Mine skews more towards a Hybrid build (but still more heavily slanted towards a Magick build), for extra survivability and in case I REALLY don't enjoy the MA as much as I expect to. (This is my first time building an MA. On PS3, I got the platinum with a rando jack-of-all-trades build, and on PS4 I got the plat with a min-maxed Assassin build).
https://stackoverflow.github.io/dragons-dogma-stat-planner/#as000000000000003c1e000000000064000000
A purely min-maxed MA would probably go Mage for levels 1-10, then Sorcerer for 11-200, before then finally switching over to Magickal Archer once the level cap is reached. You'll have stupendously powerful magickal bow attacks, but sub-par dagger attack, HP, stamina, and both defenses.
But, and I have to stress this, absolutely nothing in this game requires that glass cannon MA build, not even in Hard Mode. The game is balanced so that pretty much anything is viable. Min-maxing (of any vocation) really should be left to the folks that really enjoy it. It's never, ever necessary. Ever.
The only hard rule in Dragon's Dogma is that Offense trumps Defense. That's why the MA's level up gains suck for every possible build. It "wastes" a lot of points per level up on physical and magickal defense, when physical attack and/or magickal attack (depending on your intended build), HP, and stamina are all significantly more important stats.
In the link above, you can hover over the question marks next to each vocation name to see what stats they gain per level. Do note that you'll gain the bulk of your stats from levels 1-100. Once you hit 101, stat gains kind of drop off a cliff across the board. That's why that page is split in half. 1-100. 101-200.