I think this team fits all of the types that Ash usually has. Also, I find it funny that when Mijumaru was released everybody hated it and now it seems like everyone thinks it will be a powerhouse on Ash's team.
Well when they were displayed for the first time, everyone was excited.
and what did we get to see...
an otter with a red nose, freckles & looking sad
Though the animation can always make it badass and more apealing... which is what we're hoping for + we all hope for his waterpokemon to fully evolve, so why not make it a powerhouse and an elite-4 worthy adversary while they're at it (since ash has gained quite some experience with water-pokemon by now this could be possible)
In the anime they could make it a happy little fella which gets bad-*** in battle
And his evolution looks pretty badass allready ...
if it's water-fighting that'd be awesome and a perfect fit for ash
if it's water-ice, i wouldn't mind at all, cause he has had lapras before and it's a nice combination...
it'd make a nice variety:
Charizard => fire-flying
Infernape => fire-fighting
Sceptile => grass
Last stage mijumaru => water/fighting or water-ice
so his team in the future (against a champion) could be:
1) pikachu (always does well in important battles)
2) Charizard &/or Infernape (both powerhouses though infernape needs more experience)
3) Sceptile (powerhouse even though it's only grass-type only)
4) Mijumarus 3rd stage (let's hope for a powerhouse)
5) Garchomp (speaks for itself)
as 6th (if only 1 fire):
Normal : snorlax (idk why, but i trust it to take out at least 1 pokemon)
Flying: swellow (i just think it's his best flying-type in general)
bug: heracross
poison: muk (though i think it'll be taken out easily by an elite 4 or champion)
ice: glalie (if mujimaru doesn't become ice)
(if only he had kept larvitar -> tyranitar for the rock + dark-type and power)
no more need for
water or ice pokemon (squitle, kingler, totodile,corphish, buizel, (glalie))
ground (donphan, gliscor )
grass (torterra, bayleef, bulbasaur :/)
normal (tauros)
fire (quilava, torcoal)