Haha I do, Vari, I do! XD I just need to come up with an idea I like.
In general, do the best concepts come from creatures that are similar or very very different? Like if one of my creatures is aquatic, is it smart to use another aquatic creature, or is something else better?
I think two similarly-traited creatures will definitely have strong traits where they coincide, in the case of Ime, for example, but that has led to Ime being hilarious (and very defined) in his own right.
Ultimately, though, it doesn't matter. What matters is how you combine whatever traits you throw together to form the instinctual basis of your character, and then build up from there. ;3