Depends on how you define it. I currently have technical max level for Mezz at 99, since that's the default (I think) in RPGMaker. That mostly just means all his attribute scaling is oriented around that. In practical terms though I'm not sure it will ever go that high, and there certainly isn't enough XP in Chapter 1 to get anywhere near that.
I do plan to "carry over" levels in that I've done a middle of the road playthrough of 1, looked at what level he is, and then start players at that level in 2, just for some story consistency. So if the series goes on long enough, he may get up there.