I'll go by which starter I picked my first playthrough in each generation. :3 1st Squirtle 2nd Cyndaquill 3rd Torchic (FR/LG Squirtle) 4th Piplup (HG/SS Cyndaquill) 5th Oshawott 6th Fennekin (OR/AS Mudkip)
Poor grass types, I never go for them first. ^_^;
Charmander, Totodile, Torchic, Turtwig, Tepig, Froakie I tend to box the D/P/P and X/Y starters as soon as I catch the first 'main team' pokemon I've decided on for that round xD I do like turtwig/torterra tho, the idea of having my own walking island is pretty cool.
Bulbasaur, Cyndaquil, Mudkip, CHIMCHAR, Oshawatt, FENNEKIN,
Squirtle, Totodile, Treecko, Chimchar, Oshawott, Fennekin
Pretty much all of the starters that I picked during my first playthroughs.

same as above as well, in platinum i boxed my starter at it's second evo and just used my luxray and staraptor as mains, ha ha. 1st gen: bulbasaur 2nd gen: totodile 3rd gen: treecko (always male and named Isaac!) 4th gen: turtwig (boxed @ grotle) 5th gen: oshawott 6th gen: fennekin (wasn't all too fond of delphox though)
Hmm, this is a tough one. I think I'd choose: Squirtle, Totodile, Torchic, Piplup, Snivy, Froakie
Squirtle, Cyndaquil, Treecko, Turtwig, never played 5th but I guess Tepig, and I picked Froakie for X. c:
This actually wasn't as hard as I thought it was going to be! It seems as though I have an affinity for reptiles and amphibians, judging from this list!

I don't usually choose fire types much, unless specified.

I love all of the 2nd generation starters, so it is always hard to choose between them. At this current moment though it would be: Squirtle Totodile Treeko Chimchar Snivy Froakie
My first choices I made in each game were:
R/B/G) Squirtle G/S/C) Cyndaquill R/S/E) Mudkip | FR/LG) Squirtle D/P) Piplup | HG/SS) Chikorita B/W) Oshawott | B/W2) Snivy X/Y) Fennekin | OR/AS) Torchic
I've replayed most of them and picked other starters too. Overall, I think those are the ones I'd choose again... Squirtle's still my favourite pokémon, and I get attached to all my starters. But Treeko is really cool. :p I love Froakie too. And Bulbasaur is adorable. ; p ; /kick'd
[img align=center]https://i.pinimg.com/originals/87/1d/f6/871df6e313fe3f63979d64b141bebc64.gif[/img]
Kanto -- Bulbasaur Johto -- Chikorita Hoenn -- Mudkip Sinnoh -- Turtwig Unova -- Snivy Kalos -- Fennekin
I really like grass starters if you can't tell. :> Some of my first runs I picked different starters on, but these are my current favourites.
I would love to own all of the starters, but these were my picks:
However, my favorites by evolution would look like this:
Stage 1: Squirtle / Totodile / Torchic / Piplup / Snivy / Fennekin
Stage 2: Wartortle / Quilava / Grovyle / Grotle / Servine / Braixen
Stage 3: Blastioise / Feraligatr / Blaziken / Infernape / Serperior / Greninja
Wow, Gens 1 and 5 were the only ones consistent throughout evolutionary stages. Strangely enough, Gen 4 was the only one to use each starter across them. Delphox almost made it to my favorite Gen 6 final evolution, but Greninja beat it there (Delphox is cute, but Greninja is just plain awesome).
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I have a thing for the water starters, always have. I barely ever have used the grass staters.
Kanto - Charmander Johto - Totodile Hoenn - Torchic Sinnoh - Piplup Unova - Tepig Kalos - Froakie
I'm not really a grass type person, I normally have my team learn grass moves.
Aaaaa, this is a hard one... Gen 1: Charmander Gen 2: Totodile in HGSS, Cyndaquil in GSC (Thunderpunch is useful for it) Gen 3: Torchic Gen 4: Piplup, I think Gen 4 has my least favourite starters though Gen 5: Snivy Gen 6: Chespin
Grass starters have improved over time, I think. My starter in Y was a female Chespin, I didn't even soft-reset, I just got one. And well, Chesnaught juuuust beats Greninja even though the latter has my favourite type.