BadMoon
Demi G0D Overseer
Yeah man, I'm way past being able to do it. It gets complicated though.
This is just weapon talk but I'll put it in spoiler anyways.
Basically each character has 7 base weapons that can be found and upgraded to a second level. From the second level they each level up to a characters ultimate weapon. Depending on which base weapon you chose to upgrade, your ultimate weapon's stats will be different.
EDIT*** I leveled up my weapons properly...... My characters are now on steroids.
How did you do it? Just keep adding a bunch of random stuff to them?