Don't have access to FFXIV right now but I know you can look at the race/gender heights when you customize a retainer. I'm pretty sure max height for females is like 7'6" so males are going to be a few or so inches taller max.
For weight you're going to have to estimate since I don't believe there is any official info given. Do consider how tall and bulky roe's are so they probably weigh a lot more than humans do. Your six foot-ish average football player, for example, is probably going to be in the range of 230-300 ish pounds. A male roe is going to be probably a foot or so taller and much bulkier than a human football player.
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I know some may think something like 400-500 pounds may be extreme but as my personal guesstimate, I think it fits. But that also depends on what your roe is like.
For weight you're going to have to estimate since I don't believe there is any official info given. Do consider how tall and bulky roe's are so they probably weigh a lot more than humans do. Your six foot-ish average football player, for example, is probably going to be in the range of 230-300 ish pounds. A male roe is going to be probably a foot or so taller and much bulkier than a human football player.
 I know some may think something like 400-500 pounds may be extreme but as my personal guesstimate, I think it fits. But that also depends on what your roe is like.
