How many characters are there in including monsters I am generally. Curious and well at that how many items can the player get naturally 

Too many to count ;O;

If we include the ones you can buy from merchants and temporary quest items, as of 0.90 there are overall 679 different obtainable items in the game. About the number of characters, I can't tell you. There are currently 66 types of enemies in the game, but the game's got way too many NPCs everywhere that serve no purpose beyond decoration, and only got maybe one or two lines of text each.