Lovers--although you'll never hear Roicel admit it! Anyone who asks he aggressively and firmly corrects by telling them how much he hates the stupid seeker. (But no one believes it.) Although he'd never, ever, EVER admit it, he is ridiculously fond of the other, and would be heartbroken if the flirt didn't follow him to the ends of the earth.
Casual friends; he enjoys talking about Roicel with Nikolai (especially when Roicel is within earshot so he can get overly flustered and irritated about it.) He likes Nikolai alright, and is thankful for him taking care of Roicel. (Although he really doesn't know how to handle it when Nikolai gets all crazy about his alchemy thing...)