I'm not exactly an expert either since I've been on the wiki for a few months now, but I suppose anything in the powers and abilities section should have a justification, which this profile already has, and the more abstract things should have evidence on the blog, so evidence for things like abstract existence, concept manip, immortality, etc. Anything like that, since people on and off the wiki will often inflate feats or use the highest possible interpretation to make their favoured character seem more powerful. In general asking staff who are well versed in making profiles would be a good idea too. Having one of them look it over would likely be a huge help in making it more accurate, concise, and overall a better profile.
That's all I can think of for right now though.