Bit of a gap in-between! Though it's interesting to see the two paired up. Maybe a crossover would read like a story about an angry teen meeting a cute, bright-eyed kid and learning to appreciate the nicer things in life like he used to when smaller.
it would be cool to see tetsujin 28 drawn in the eva mech style, like a crossover, except where eva is slim and nimble, make tetsujin 28 thicker and with a larger abdominal mucsle are, bigger overal bone structure, and larger thicker limbs. and have the armour be more covering and reminicent of tetsujin's lines but with the same pannneling armor seen on eva 01's torso. also, make tetsujin's lower jaw peice be able to open up revealing huge teeth gum's and a toungue just eva 01 in berserker mode. if you look up male body types, eva 01 would be a mesomorph, and tetsujin 28 [retro tubby 2004 version] would be the equivelent to an endomorph. so basicly, take eva 01, draw him with tetsujin 28 designs with more armour pannels, and a thicker muscular endomorphic body profile. if you know someone who would be a good canidate for a comision of this kindof fanart, let me know so i can ask them to make this image be a reality peice of artwork, as my skills arent good enough to draw it myself.