lopunny has a bit of yellow(ish) colour on it & definitely looks female - that would work too - but having 2 normal types on your team isn't great... maybe you could use raichu for splinter? or maybe jynx would work for april?
so far i've come up with:
lucario aggron (shredder)
wobbuffet (krang) i may change this to a pink gastrodon as wobbuffet is uberbroken...