Alastor 5p is the happy one, while Alastor already presents himself with a constant smile, 5p's is more wholesome, and genuine.
Alastor 5p is the less violent version of normal Alastor, and the acts less mean-spirted than Alastor 6p he is a deredere (someone who is constanly happy in anime and shows and whatnot). He is shown to (possibly) have a dark side in the illustration on screen, but I haven't seen anything about that anywhere else. He's probably the most mentally stable Alastor.
According to this random roleplay account that technically is not made by the real creator of 5p and co. but the point of these is to show everyones interpritations so whatever he likes "Kittens,drawing,jokes,making people happy,and blood" I personally think he would tell way too many dad jokes and puns. Also this blog says that 5p hates puppies???? Thats just uncalled for.
Woooo
-Alastor 6p-
Alastor 6p is also a very happy Alastor, but he tends to be more petty, and hurt people in a psychological manner than physically like normal Alastor. They are probably the more common ship with 5p because they have a lot in common, but still manage to have a fun dynamic. (even I think they're neat)
-Alastor 4p-
Alastor 4p is the more nervous, and anxious Alastor, and you know, their numbers are next to each other so they're shipped together.
Since they have very diffrent personalites, (carefree, and worryfull) they have a intresting enough dynamic for me to find a singular drawing of them
Name: Sunny
Pronouns: (he/him)
Gender: lolgender, pupgender, princegender
Sexuality: panromantic, asexual, demiromantic