I made this into its own topic, @GalaxSpace and @Essence for future reference. Also:
Zetasis is very much correct, if you buy them from RPG Maker, you cannot use them in Intersect, let alone make money off it (if intended).
Well you'll only have to make them smaller if you purchase the RMMV styled pack.
I would recommend buying them from the game dev market because if you buy them from the rpg maker site you only have the rights to use them with rpg maker and not be allowed to use them in intersect.
@Essence
I see that you use the fantasy pack so I would like all the bought but I have a doubt because on the site of the creator there is a pack has 15 $ which includes the packs tiles and characters? Or should I take all on gamedevmarket?
http://www.hostingpics.net/viewer.php?id=185576Sanstitre1.png
http://www.hostingpics.net/viewer.php?id=530177Sanstitre2.png
How should I proceed?
Honestly, buy them all from Game Dev. They are fairly priced and content is being released regularly for it. With all the packs you have a complete world (Terrain wise) and can make paperdolls by editing sprites or even new sprites by cutting and pasting them together. You can also find graphic packs that fit for weapons and items for a fair price on the site.