General tips on consistent roleplay?

[Swallow]

At some point I understood that no matter how I try I fail to keep my RP out of those moments, when my characters act not as I intended initially. For instnce, this could be some kind of hasty actions or sudden personality shifts, which do not really fit the character. This ends up in weird behavior and messy RP sometimes, which reduces the satisfaction of gameplay.

So my question on this matter: what are the possible tips to keep my characters and their RP consistent and... Less weird?
The more different opinions you give the better.

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FL MOD(EL)MAKING: TOOLS, RESOURCES, TUTORIALS AND MY SHIPS (OLD)

I am on discord: Roal-Yr#5994, I don't log on forum more than a few times a year.

I am not making ships for FL anymore, I am making my own space game instead:
https://github.com/roalyr/GDTLancer
https://roal-yr.itch.io/gdtlancer
https://youtube.com/playlist?list=PL5HQB...cdH45LZgjj