About starting Character trait

[Lily]

Any recommendation for which are good and which are so-so?
I am talking about the +exp/research points, +atk power, +happiness, etc.

[F_F]

You single most important stat is movement speed. Faster movement means you can get to riots quicker or to downed rats and invasions. I think the character trait with movement speed is called Explorer.

[HunterSilver]

Tl;dr:
None of the modifiers make a huge difference, but they're a nice little bonus. Grab whichever one you want and don't worry about it too much.

Long Answer:
Prestigious Scholar is the best for your very first playthrough where you don't really understand what's going on, or what you should be researching. Three extra research points will let you make a few unhelpful choices on the tech menu without slowing you down.

Natural Born Warrior and Agile Explorer are both better on Normal difficulty than they are on Easy. There's much less of a time crunch, raids are smaller and more spread out, and just overall there's no need for what they do on easy difficulty. Note that your starting gear gives you bonuses to move speed% already, so the benefit from Natural Explorer is smaller than you'd think. Carrying Capacity also caps at 10 items carried at a time, so anything over that is lost.

City Idol is fine. It's hard to notice it doing anything. Bonuses to migrant stats is theoretically nice, but in practice it usually translates into getting a 5% productivity bonus slightly faster than otherwise.

Prodigal Noble is for Hard Mode. Hard mode has a really limited starting gold of 5000, making it difficult to get your first few ratizens enough money to function. 3000 extra starting gold means you can take on more rats faster and still have them comfortably afford necessities and services.

[Lily]

Thanks a bunch for this really detailed explanation.

[GADefence]

Prodigal Nobles is absolutely awful for hard mode, and is definatively more of a easy mode perk.

+3k$ = prestige lvl 2 faster = harder enemies faster.

Cash should never be your problem with decent taxes.

Out of the rest, warrior is basically worthless (+20HP will rarely save you as you either die horribly or win easily, and +1 attack will rarely be useful since either the thing won't die with a few HP or would be dead anyway as everything takes only a few hits and defenses are your main killers), city's idol is worthless since +1 migrant lvl is good not great and +1 happiness is basically nothing, prodigal noble makes your game harder rather then easier (plus you get a free 3 grand quest when you're low on money anyway and you should also skip that).

That leaves +30% XP and +10% movement speed. Take whichever one you want. I take movement speed since the flat +10% beats out the diminishing returns on high end dexterity.