What are Emotional Levels? Every character has two types of points, which indicate how they feel towards the other characters in the game. FP is Friendship Points, and RP is Romance Points. Each character has 11 sets of these points, one for every other character in the game (yes, even though you can only get a total of eight characters each time you play). For characters of the same sex, FP is the "primary" indicator and RP is the "secondary" indicator. For characters of opposite sexes, RP is the primary and FP is the secondary indicator. Note that characters do not necessarily have the same Emotional Levels for each other; Noel's FP towards Chisato may be different from Chisato's FP towards Noel.
What do Emotional Levels do? Their main use is for character endings. The game will pair up two characters if their primary points are above a specific number (10). The highest primary point for any other character will determine that character's pairing. Let's see some examples. Following is a table of Claude's Emotional Levels towards other characters at the end of the game. In the second column, the first value is FP and the second is RP.
The preordered list is as follows:
Another effect of Emotional Levels is how characters controlled by the AI treat each other in battle. The higher the primary points towards another character, the more they'll like each other. For magic users, this means they'll cast healing/protection spells on them before other allies. For fighters, it means they'll stay closer to them and protect them if enemies come calling. For both kinds, it changes the way they react when the character is knocked out. There's always a small chance that any character will go berserk when another character dies (they'll say something like "I can't forgive you!" or "Now I'm mad!"). But when a character close to this character dies, they'll actually call out his/her name; plus there's a much higher chance of them going berserk when they do die.
OK, so now we now what they are, how do we change them? There are three ways. One is using items. Books made through Publishing can be used on individual characters; doing so sets one Emotional Level to a set number (8). Two kinds of books can be made using Publishing; regular books, which affect FP, and rare books, which affect RP. For example, using Precis's regular book "Buy it...OK?" on Ashton will set Ashton's FP towards Precis to 8. Using the item "Twin's Tonic" will set everyone's FP towards that character to 8, and using an Aphrodisiac has the same effect, but with RP. Note that 8 is too low to get an ending with that character, though!
A second and more important way is to enter Private Actions. One-time Private Actions change FP and RP based on your choices. However, 95% of these only involve the main character and the other characters, not two secondary characters together. Changing FP and RP of other characters towards each other is a bit trickier. One way to do it is by having the main character be mean to both characters you want to hook up. Note that FP and RP are not generic values; there's only so much love you can have, and if your FP raises towards someone, it'll lower towards others, usually. Conversely (though not as commonly), if your FP lowers towards someone, it'll have a higher chance of going up towards someone else. So you can't be nice to everyone if you want to hook up with a specific person!
The third way involves fighting battles together. When two characters fight about 100 battles together, their primary points will increase by 1. The increase will be greater, as I've said, if other characters are mean to them.
Note that using books is a good way to sabotage your FP/RP points just before finishing the game. If you're getting the ending with Rena too often, let her read your book and her points will go down to 8, meaning another character will have a chance. If after doing this you get the "alone" ending, though, you're screwed, because no other character has primary points above 10 for you and you can't see the other endings right now.
Thanks to Ian Kelley for this list. The first number is FP and the second is RP. For example, Rena has an FP value of 6 towards Opera, and an RP value of 5. (Opera, though, has values of 4-4 towards Rena.)