If you're looking for more suitable units for the skill, I've seen some push for Diamant. His weapon disables non-Special percent based DR so the con of Laguz Friend isn't applicable to him assuming no support.
I've also seen people wanting to give CYL Dimitri Laguz Friend but I'm not convinced it'll beat Blue Lion Rule, especially if he's trying to tank magic. If he's tanking physical damage, then they might perform similarly. I haven't done the math to support this so it's just my speculation.