Is there an ideal personality that everyone should strive to become?

No. The world needs a balance of different personality types. Everyone needs to be fully themselves, not some magical universal ideal personality. The world is a complicated place, with many individual positions to fill, roles to play, for the sake of the individual and collective journeys of everyone involved. There's no single personality type that's suited to every position unless you count the null-void personality type of infinite possibility - can be anything, anywho, at any time, always appropriate to context. But that's not really a personality type in itself, and the effort to become that would wash out the essence of individual types only achievable within a lifetime through specialized focus on being oneself, not any/everyself. If we minimalized the roles to be played so that one real personality type fit every bill real nicely and everyone got along, well, that would be just plain boring. There wouldn't be enough going on to make this world of any interest to the adventurous spirit.

I don't know if this is ideal, I don't know if this is superior, but I believe if everyone strove to be a person who respected and tolerated and empathized with all other personalities and people, all types of conflicts would stop.

I admit most will believe this will appear quite anti-humanist, but I sometimes wonder if personalities really exist. After all, people change behavior patterns to suit different people as we mature and learn social cues. I'm not saying that we're Turing Machines, but personalities are as much as a present as a continuous thing. I postulate that personalities are at core, beliefs and methods. Beliefs are mental pathways that expect a particular input to an output, that is, one is greeted when one greets a friend. Methods are obviously what we think, calculate, and do, and are solely existent for directing general thought and creating a base for realtime consciousness. To exist in reality, both beliefs and methods must align to a social network and the laws of reality (method::fly does not work). And it is known that personality is a result of both genetics and social training (in nearly equal parts, it appears). Thus, a "superior" personality, if there's such a thing, is the one that dominates a society as it reinforces itself and trains new subjects into the social system (i.e. cultural systems). As real world examples, China is hard-working, British folks are quite precise, Mexico is a party-house, and Americans are...well...Americans. Thus, if you were really serious about creating a "master personality," I have an answer but am unsure of it myself. I'd suggest that, quite controversially I'll admit again, given my belief in social-personality systems, the prideful, Greek-y personalities would be superior if the world becomes more competitive and socially interwoven, because people would not disagree about the values of hard-work, friendship, or pride, and not tear down another but seek the top. We'd compete not by brute force but by belief in personal strength. Of course, this is an exaggerated, horribly social-Darwinian, social-ideal model (personality is only partly social, some will be criminal-minded anyway), so the real answer is that you don't got to worry about it: just be thankful for the personality you've got, but be even more thankful for the next one that comes, because 1. everything that don't kill you makes you stronger 2. it most likely is more aligned with reality and important ones aka matured. We're humans in a inhuman world and that's what really should matter, not merely running away from conflict. Sorry that was so long, I do hate avoiding explanation.