[@liferusher] 
Things Meruin looks for in a familiar:
Can they hold a smart conversation?
Are they quiet when needed?
Do they possess a unique ability/bloodline/mutation?
Are they rare as far as familiars go?
Will they not disturb Meruin when experimenting/sleeping/eating/sleeping?
Will they allow Meruin to experiment on them?
And for extras:
Are they warm and soft? If yes, will they allow Meruin to sleep on them? Bonus if they're fluffy.
Can they cook? Bonus if they can cook gourmet food.

As you can see, Meruin has a lot of wants when it comes to a familiar, but she could really care less if they were powerful. What she really wants is something unique that she can use.