Earth+Earth = Earth
Earth>Fire = Metal
Earth>Water = Wood
Earth>Air = Sand

Fire>Earth = Sulphur
Fire+Fire = Fire
Fire>Water = Steam
Fire>Air = Lightning

Water>Earth = Blood
Water>Fire = Catalyst
Water+Water = Water
Water>Air = Snow

Air>Earth = Sound
Air>Fire = Nuclear
Air>Water = Miasma
Air+Air = Air

Thinking Type:
There are 9 thinking types, based on the Enneagram of Personality. The Thinking Types determine stat bonuses as well as what your homunculus likes to eat and do. With a wild homunculus, the Thinking Type determines what types of questions they may ask you or things they may ask for when you recruit them.
Thinking type is the only visible personality facet, seen on the status screen.

1. Reformer:
Reformer homunculi tend to be perfectionists. They seek balance in everything they do, and can sometimes become over-critical of themselves.
Stat Bonus: Health
"Uhm, excuse me sir/ma'am alchemist... but the third button from the bottom on your jacket is undone"
"No, no, no! I should have used my charge attack instead of that spell... stupid, stupid me!"

2. Helper
Helper homunculi are the spreaders of cheer and joy throughout Roeizek. They are kind, caring, and giving, however they may not pay attention to themselves.
Stat Bonus: Spirit
"Here, I saved this meat for you. What do you mean, I haven't eaten in three days?"
"You're the best alchemist ever! I really mean it!"

3. Achiever
Achiever homunculi are homunculi of action, trying to always be doing something. This can be a disadvantage, however, because sometimes they can become unaware of their own emotions.
Stat Bonus: Melee Attack
"40.7 seconds to maim that Birddon... a new record. Let's get moving"
"Come on, go go go go go go!"

4. Individualist
Individualist homunculi are, in essence, the emo kids of Roeizek. They focus their thoughts on their feelings and emotions, and wish to be true to themselves and others. They are very sensitive, but can also be drama queens.
Stat Bonus: Wisdom
"I chipped a claw back there... man, I just feel like crying right now"
"Hey, do you have my Little Man CD? Their music is sort of a guilty pleasure for me"

5. Investigator
Investigator homunculi live for knowledge and wisdom. They want to know everything! Investigators are calm under pressure and objective with others problems, though they tend to have detached relationships.
Stat Bonus: Magic Attack
"Okay everyone, stay calm. 2 casualties isn't bad"
"Did you know that moving coffin homunculi were used during the Plague Years to get the infected bodies far away from cities?"

6. Loyalist
Loyalist homunculi want to feel safe always, so they usually turn to their alchemist or another authority figure for protection. They have the uncanny ability to tell when someon is lying. They can suffer from severe paranoia.
Stat Bonus: Mana
"I swear, that tree moved! Will you hold my paw?"
"I KNOW you ate that last cookie"

7. Enthusiast
Enthusiast homunculi try to block out bad experiences, believing that it is a waste of time to think bad things. This makes them optimistic and fun to be around, however when they must deal with unpleasant things they tend to break down.
Stat Bonus: Physical Defense
"Think happy thoughts!"
"Don't tell me he's dead! PLEASE don't tell me he's dead"

8. Challenger
Challenger homunculi are leaders, strong allies that other homunculi look up to. They are very self-sufficient, however, this can lead to them being controlling of those around them.
Stat Bonus: Charisma
"I can do it myself"
"You're doing it all WRONG!"

9. Peacemaker
Peacemaker homunculi just want everyone to stop fighting and get along. They make warm, thoughtful and kind friends, however they can have trouble expressing when they DO get angry, and can also have difficulty saying "no".
Stat Bonus: Magic Defense
"Come on you two, it's not a big deal"
"Well... I guess I'll do it"