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It's usually best not to rely on stats for your damage mitigation and avoidance. For instance, a druid's access to constant earthglide through elemental form is going to do more for their survivability than a high AC would.
There's also impossible to kill options in the game such as an Eldest worshiping summoner who summons a Remacera (summon monster 5, eldest summoning only) each morning to scratch him up so that he's reincarnated should he ever die before healing to full hit points.
Slightly more conventional options would be to include the ability to cast symbol of mirroring and false focus in your build in order to get constant mirror image effects. Though it may be more valuable to have a permanent version made on something that could be concealed when not needed.