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When you think about it, about half the Pokemon protagonists are relatively safe and "generic" to be familiar, since they're the player's avatar.
Red is an average kid with a baseball cap, jeans and short sleeve jacket. Leaf is essentially a Lass with a hat. Black hair in Gen I, brown in III.
Ethan's a kid with a backwards cap, a hoodie, and shorts. Black hair.
Brendan wears a track jacket and sweatpants, along with a beanie. Black hair in RSE, brown in remakes.
Lucas and Dawn wear winter coats. Dawn has a beanie, Lucas has a hunting cap. Black hair.
Hilbert wears a baseball cap, jacket and black jeans. Hilda wears a baseball cap, vest and ripped jeans. Brown hair.
Calem wears a track jacket, jeans and boots. Red cap with sunglasses. Serena's outfit is like Leaf's, only with the skirt up higher and sunglasses. Black and brownish blonde hair.
You has a baseball cap, striped shirt and capris. Mizuki has a flower hat, oversized floral shirt and short shorts. Black hair.
The most outlandish you'll get is Kris (blue hair, skull cap, unnatural twintails), Lyra (casquette hat with ribbon, overall shorts with a long sleeved hooded top, single-striped socks) RS May (collared top, bandana, compression shorts), Nate (bedhead, white pupils, swimwear underneath the outfit, visor), Rosa (Sailor Moon hair, white pupils, visor) and any customized version of Serena/Calem/You/Mizuki.