I just realized that Selever and 682 have a lot of things in common. Especially when it comes to Rasazy and Rosie. 

Both of them have seen countless universes and different versions of their families....but the problem was....they would always see them die in more ways than one.

Selever is a pessimistic demon who is Rasazy's older brother. He's EXTREMELY protective of her and wants to make her happy in any way he can.

682 is an immortal being who loves his sisters Holly and Rosie to bits. He's also very protective of them and wants to make them happy too. 

The difference is....

Selever is an emotionally challenged demon teenager and has impulse control issues....that developed due to his isolation along with his sister....he has the power to go through different dimensions through portals he makes....

He's spent an eternity in his pocket dimension alongside Rasazy....that developed social anxiety....and he absolutely HATES seeing different versions of his parents and different versions of themselves being with them as he sees this as seeing the inevitability of death and how it's the happy ending he'll never have. 

682 is an immortal SCP who has seen different versions of his sisters dying before his eyes....he's a pessimist but that changed due to the sibling love his sisters have for him. Even though he'll be alive when the world ends, his sisters will always be with him. 

These are the comparisons.