IDK
I'm not sure how the Sprunkis would look when they go through seasons, but I'm sure Blanche would have a pair of earmuffs for winter
but what I can tell you is that Maria never changes her appearance (she is way too lazy)
Thanks. Also i took The future Blanche(5 years older and 15 years older)from The logic Of The episode "Practical Jerk" from Looney Tunes Cartoons.
its your choice how you want it they dont wear clothes so they dont change in different seasons
but if they did wear clothes they would match with the theme of the season im not sure for jevin and funbot cause they wear torso covering accessories