My brother always chose Water starters when he played a Pokemon game.
This is what he chose so far:
Sapphire - Mudkip
Emerald - Mudkip
Diamond - Piplup
HeartGold - Totodile
He told me that once he gets White he will break the trend because he hates Oshawott.
He also told me he would use Snivy but I told him how terrible it is so I think he might choose Tepig.
This was my starter pattern:
Ruby - Mudkip
Pearl - Chimchar
Platinum - Turtwig
SoulSilver - Cyndaquil
Black - Oshawott
So that's 2 runs of Fire starter, 2 of Water starter and only 1 for Grass starter.
My brother thinks Tepig reminds him of this: