Pokémon: Rapidash
Typing: Fire
Stats (changes highlighted in bold): 80(+15)/100/70/65(-15)/75(-5)/110(+5) (500)
Abilities (changes highlighted in bold): Flash Fire/Unburden/Defiant
How this makes it more interesting: Slightly better Speed and HP to better sustain recoil damage and two good abilities to either pull off a SD + Seed set under Terrains or punish attempt to Intimidate him. Flash Fire isn't too shabby either, as in CFM it raises the higher offensive stat by one when hit by a Fire move. Didn't add new moves, as imo Rapidash already has just the right moves it needs for its job.
Pokémon: Mr. Rime
Typing: Ice/Psychic
Stats (changes highlighted in bold): 105(+25)/65(-20)/75/113(+3)/87(-13)/90(+20) (535)
Abilities (changes highlighted in bold): Tangled Feet/Ice Body/Screen Cleaner
Moves: +Court Change, Sheer Cold, Taunt, Torment
How this makes it more interesting: Stat were adjusted following the lead of CFM Mr. Mime. Now Mr. Rime can pull off a NP + Spin set better with its newfound Speed, but other than that it gets more supportive options, most notably Court Change (kind of bugged me how Cinderace had two signature moves whereas the other Galar starter had just one), giving it another option to control the battlefield.
Note: to go along with Mr. Rime's stat spread, I'm also including a new spread for Galarian Mr. Mime (85/55/65/93/77/110) after talking with the others on Discord.