Yes. You can go back and explore to find all the collectibles.
Yes, you can. There are various side quests and expansions that you can undertake even after completing the main story.
Yes. There are side quests and other content.
In my opinion, starting with the main quests in Velen like 'The Bloody Baron' is a great start. It sets the tone and introduces important characters. Then move on to some of the related side quests in the area that expand on the story and characters you've met. After that, head to Skellige and follow the main quests there which often have a more epic and mythical feel.
Yes. Skellige related content is still available. You can go back to Skellige and do all the things you could before, like exploring the villages and fighting sea monsters.
One good strategy is to follow the critical path of the main quests in the order they are presented. This will keep you on track with the overarching story. After that, you can go back and do the side quests in each area you've visited. For example, after finishing the main quests in Velen, do all the side quests there before moving on to the next area.
The Witcher 3's main characters included: 1. Geralt, also known as the "White Wolf", was the protagonist of the "Witcher" series. He had received strict swordsmanship and magic training since he was a child. His body had been modified by various potions and magic, and he had extraordinary strength, speed, and reflexes. However, his body had also mutated, such as his eyes, skin color, and snow-white hair. He was the strongest witcher and accepted the mission of hunting monsters to earn money to support himself and protect humans. However, most humans regarded him as a non-human race and discriminated against him. 2. [Ciri (Cirilla Fiona Iren Leanron): The heir of the Ancient Blood. She has the power to travel through time and space. She is an important character in the game.] 3. [Yennefer: Geralt's lover, plays an important role in the development of the story.] 4. [Triss: Female Warlock, also an important character in the game.] 5. [Harma]: A character from the Skalig Islands. Although she looks like a "boorish" character, she has shown her loyalty in the game. For example, she has helped her friend out due to her relationship with Ciri. She has sincerely wished her sister well after the king lost the election. She has shown her wisdom during the bear transformation incident. 6. [Vivaldi: A dwarf banker of Novigri. He is easily portrayed as a miser and has a complex personality in the game plot.] 7. Zoltan: Geralt's good brother, a dwarf. He fits the image of a "brother" who would do anything for his friend, but his actions do not completely match this image, such as his attitude and reaction to Geralt in different situations. 8. [Lambert: As a Demon Hunter, he is a romantic and emotional character. He is very clear about kindness and hatred towards his friends. Although he hates Kaer Morhen, he will step forward when he is in danger and avenge other Demon Hunters.] While waiting for the TV series, you can also click on the link below to read the classic original work of "Dafeng Nightwatchman"!
No. While many heroes can be gained from the story in King's Raid, there are also some heroes that are obtained through other means, such as special events or gacha systems. For example, limited - time event heroes are often not part of the story - based acquisition.