So, I was browsing Nexus for mods and saw this mod.
https://www.nexusmods.com/pathfinderkingmaker/mods/96
This mod allows you play gestalt characters. What is gestalt you might ask. It is an alternative level progression which you pick 2 classes on a single level up. You get abilities of both classes and highest of the skill points, BAB and saves. It is very similar to ad&d multiclassing. Check following link for more info
http://www.d20srd.org/srd/variant/classes/gestaltCharacters.htm
I want to start a gestalt campaign with only part of 3 (mc and 2 companions). I have several build ideas but I wonder if anyone has interesting concept that couldn't fit a vanilla playthrough.
Some simple examples:
Druid 20/ Monk 20 : Wildshape suddenly become very very dangerous
Cleric 20/ Fighter 20: This is what you actually want from Crusader Cleric Archetype
Wizard 20/ Monk 20: This is a classic from pnp, it gives a pretty good chasis upgrade to Wizard and increases potential form of the dragon spells very much.
Or you can channel your inner InEffect and slap Vivsectionist 20 to any build you use.