If you are a player in Escarnum, you should think hard about the character you want to portray, whether you are planning their personality in advance or developing it as you go. Consider ways you can use your character's goals and quirks to enrich the game for everybody – especially ways to cooperate and advance the story. Work together with other players, and be conscious of how much time you spend in the spotlight so you can make sure everybody else gets their turn.
In-character conflict is valuable when roleplaying, but make sure it doesn't leave the game world. If you foresee a situation where your character might make things difficult for the group, conspire with your fellow gamers to keep them in check. Share your ideas, and be open to suggestions from other players. If you don't let it become an obstruction, your character's personality will be a powerful tool for adding to the story.
If you are a GM in Escarnum, think of how you can pitch plot hooks at the characters' individual motivations, rather than just offering treasure or fame as universal incentives. Involve them as deeply as possible; don't let a plotline be something they can just walk away from. Try to empower the PCs as much as you can; this doesn't mean giving them more power in terms of game rules, but in the way the world and the story treat them. Run with their ideas when you can; reward them for taking initiative and use their own concepts to keep them hooked.
Use the world to treat the characters as their players envision them; if somebody is playing a gnoll because they like their character to be alienated, have NPCs draw attention to them or challenge their presence. If a player wants her wu-kan to be an infamous rogue, have them be recognised (for better or worse) except in the most backwater towns.
Strong characterisations can make or break a story, and a story is what you create in Escarnum. Work together with your group to make sure each character gets to be the person their player envisions, and the experience will be better for everyone.