I actually love [name_m]Seymour[/name_m]! And I say this even as a big fan of [name_m]Little[/name_m] Shop of Horrors, which is where I assume a lot of people go with pop culture references. I agree that it feels so cozy. I also think it goes with the rest of your list pretty well in terms of style, so I see why you’re drawn to it!
I also really like [name_m]Gilbert[/name_m] [name_m]Wilder[/name_m], [name_m]Linus[/name_m] [name_m]Benjamin[/name_m] & [name_m]Linus[/name_m] [name_m]Ambrose[/name_m] (I actually think the “Lamb” idea is so cute) from your list.
I think we have some similar favorites as I’m a big fan of [name_m]Gilbert[/name_m], [name_m]Samson[/name_m], [name_m]Linus[/name_m], [name_m]Grover[/name_m], [name_m]Clifford[/name_m] & [name_m]Rudy[/name_m], so if you ever wanted new suggestions, I could probably offer some (but since you didn’t ask for them here, I’ll refrain for now!)