Robin remained with Nami and Franky after they entered Fish-Man Island. They went on their separate ways to do different things. Robin decided to explore Fish-Man Island to study history.
Robin also progressed in terms of strength during the time-skip. She managed to improve the usage of her Hana Hana no Mi and could produce a thousand limbs at once instead of a hundred. In theory, Robin got ten times stronger after the time-skip.
To be fair, Nico Robin has become stronger after her time with the Revolutionary Army. She has amazing new cloning abilities, can glide through the air, and can summon destructive giant legs.
Robin was 28 years old pre-timeskip, and 30 years old post-timeskip. Franky was 34 years old pre-timeskip, and 36 years old post-timeskip. Brook was 38 years old at the time of his death, 88 years old pre-timeskip, and 90 years old post-timeskip. Source: The One Piece wiki.
Robin also seems to be very devoted to Luffy, as he is the only person whom she wants to get stronger for. This shows how great her dedication to her captain has become after the Enies Lobby Arc.
Boa Hancock is 31 in the story, twelve years older than Luffy's 19. On the other hand, Nami is just 20.
They wouldn't be our heroes if they weren't ridiculous. Having their pride on the line, the bounty usually refers to how strong a pirate is. Since Sanji is claiming his bounty to be higher than Zoro's , he is boasting that in he is the second strongest member of the Straw Hats crew.
Ron got Splinched Splinching, according to Apparition Instructor Wilkie Twycross, happens when a wizard's mind isn't focused, meaning that while one part of you may teleport to your destination, you may end up leaving another part of your body behind.
Ron Weasley had deep scars on his arms from being attacked by brains with tentacles at the Department of Mysteries. Madam Pomfrey applied Dr. Ubbly's Oblivious Unction which did a little good, but she also observed that "thoughts could leave deeper scarring than almost anything else" (OP38).