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For the Kobold there are 2 scenes, one where you need to be small (have stats close to when you start the game, you can maybe use a tiny elixir or a yellow berry to help with that) and one you can get if you wear the hat you get from the cobra.

There are a few scenes at the Unholy Hollows and to get there you need to get the Giant Werewolf's business card. The way to get it is different depending on your species. You'll need him to confide in you about how he feels about humans and to do that you'll likely need to get him his moon artifact from the temple, remind him that you were the one to give it to him, and then talk about his tie.

There's a scene with the cobra if you try casting the Spell of Love on him 

For the Alligator Pirate, answer his three questions correctly then find him at the pier (you need the Stuff Animal item to be able to answer all of the questions) 

For the Forest Knight, when he's small he'll be at the Gym. Lift enough weights to impress him and then compliment and grapple him in battle. If he's too big to be at the Gym then you can use a Black XP potion on him to set him back to level 1. The Black XP Potion can be bought from the Turtle Alchemist after bringing him an empty XP Bottle.

 For the Smug Kangaroo, just wait until he's big and compliment his body. 

To get to the scene at the shark's place you have to talk to the bat and shark at the bulletin board at night with at least one of them interested in you. For that to happen you either need to flirt with the shark and then apologize to him or talk to the bat about something he's interested in and then ask him to do something else once he's at stage 3. After the scene with them together you can get scenes with them individually by repeating the things that got them interested