Who would make the best legendary super saiyan for a spin-off?

I’d say Future Trunks, obviously in his timeline everyone dies when he’s 1 and Gohan dies when he’s 14. Have him struggle to hit LSS until Gohan dies, then he has to learn to control/master it by himself, then when he goes back in time to wreck Frieza he doesn’t go LSS until he fights Goku, mops Goku up and disappears back to his timeline for like a 60 episode side series