People who are confronted with an interface char- acter, for example an embodied agent, perceive both its appearance as well as the action possibilities (affor- dances) it offers for task execution. Appearance aspects such as aesthetics explain user engagement with the in- terface character (Engagement process). Outcome expec- tations of using affordances explain use intentions (In- teraction ... [Show full abstract] process). Interestingly, dependencies between these processes may exist. Appearance aspects may in- fluence use intentions (people are more keen to use a graphically nicely designed than a graphically ugly de- signed system), and affordances may influence user engage- ment with the interface character (people are more engaged with an interface character that offers help than an in- terface character that obstructs task completion). As our theoretical basis, we use the I-PEFiC model, which inte- grates the Engagement and Interaction processes. We pro- pose an experimental study based on this model which will give indications on how bonds between humans and inter- face characters are established or broken down.