One of the issues games have is copying hairstyles. This shows a lack of creativity and is also stealing someones design, which makes it viable for a lawsuit.
The other thing that developers take are voices. If the game is voice acted, it often has very similar voices of another game a lot of the times. Many times I'm playing a game...like Witcher 3 with Geralt. Suddenly I'm playing Spellforce 3 and hear Geralt again! Obviously they took his voice from Witcher 3 and used it. Even though Spellforce 3 is made by an entirely different company and has nothing to do with Witcher at all.
The recent thread about Cyberpunk in this section, made me think of all the things that are taken from other games. Hairstyles and voices being the most obvious of these
My Skyrim, Fallout 4, Starbound and WoW + other game mods at MODDB: