Lennox would be a meister definitely, a overachiever meister who's about to obtain the soul of the witch but keeps getting interrupted or sabotage by Yusrif which makes go insane. His weapon would be Haruki if Haruki was a weapon.
Yusrif would be a weapon, a whip, he wouldn't let just any meister use him but only the best of the best. Bonus point if he can irritate the meister to the point of snapping which makes him laugh, especially when him and Lennox would be paired up reluctantly which makes taunting Lennox easily.