Okay upping the game for step by step character Build. still Based off of a Human but with magic and the like in the mix.

first and for most basic stats. (for roll20 i always use a macro: &{template:default} {{name=Stat Roller 3d6r1}} {{1=[[3d6r1]]}} {{2=[[3d6r1]]}} {{3=[[3d6r1]]}} {{4=[[3d6r1]]}} {{5=[[3d6r1]]}} {{6=[[3d6r1]]}} {{7=[[3d6r1]]}} {{8=[[3d6r1]]}} {{All 2's and 3's Set 1=[[3d6r1]]}} {{Bonus Die Set 1=[[1d6]] [[1d6]]}} {{Bonus Die Set 2=[[1d6]] [[1d6]]}} {{Psionics?=[[d100]]}} {{Major=[[0]]-[[9]]}} {{Minor=[[11]]-[[25]]}} {{None=[[26]]-[[100]]}} We can assume this person will have psionics. 

We'll use a more mess plan for this. I.e. aliens unlimited . Alien Appearance  Unearthly Environment  High Gravity 65-66 Humanoid Pig : Husky build with a large, wide, pig nose and mouth, small eyes, and large ears. Can be smooth and pink with thin hair, or have coarse white, grey or brown hair and look boar-like, complete with a wild mane of hair on the head and running down the back of the neck. Bonuses: +1 to both P.E. and P.S. and +3D6+6 to S.D.C. 06-14 High Gravity:  The gravitational force of the alien's home world was considerably greater than Earth's. This gives the alien greater mass and physical endurance, and he is much faster and lighter on our planet than on his home world. Height: 5 feet plus 1 D6 inches (1.5 to 1.7 m). S.D.C. Bonus: 3D4x10 P.S. Bonus: Add 2D4 to the P.S. attribute, increase normal speed by three times, and + 1 to initiative. (In Rifts that would mean he would be M.D.C. with supernatural P.S.) S.D.C.:Base  30.

Character sheet basics First we'll be setting up the macros as above we click attributes and abilities. and we'll set the Macros in. We click abilities.  And then Add. 

We'll be sing a basic template macro for a lot of this. then look at token macro stuff later after we make the character Basics. &{template:default} {{name=HitpointRoller 1d6r1}} {{1=[[1d6r1]]}} this is a basic hitpoint roller but can be changed to pretty much anything Make sure rename the macro box to what you want it to be. We'll start with the human macro. (which with aliens unlimited rolls are added to them.). Generally i would not add the psionics possibility. At this point in the mess its fine.(to be clear this would fly in the mess. but don't count on it as always with me.)