for mika, i like narumika, nazumika, and ritsumika the most! for shu, shunazu and kuroshu are def my faves with him outside of mika, but i also like poly oddballs and any combination of them with shu (reishu, watashu, natsushu, kanashu, you get the gist), as well as leoshu.
i actually first shipped shnz when i watched the enstars anime and first got into enstars (very long story) but now i produce and consume more shmksh (very obviously, with the content i make and repost all the time). poly ex-valk and any combination is probably my second fave ship i think but i also love krsh and nrmk too much

i do also enjoy eichi/shumika or rinne/shumika but it's more as a form of psychological warfare against them. rinneshu is a good ass ship tho i see more content of them on the tl and i enjoy it i think they're neat

i will enjoy quite literally any ship you give me with shu or mika in it. i can be talked into anything and see potential plots with any of them. this applies for literally most enstars ships too but heavyheavy emphasis on the shu or mika being included since they're my oshis.
[insert bill nye image "i can imagine anything"]

like i said in my carrd, i multiship them and i don't have any notps, not any that i can think of/have to set up a boundary with, particularly in enstars
it's fiction man why should i care about pixels on a screen when i can go touch grass and go get a nice coffee and croissant outside
but !!!! i am chill with people if they don't like it tho !!!!! some of my close friends and i do not agree on ships and that's ok with me. i'm a strong believer in muting stuff if you don't like it, especially because of different interpretations of fiction and being able to hold multiple opinions and nuances of a character at the same time. yeah i like shmk the most but i loooove love love seeing content outside of them with other characters and experimenting with new dynamics / different storylines and characterizations

i think they're both just neat little guys and i love them an immense amount so i think other characters should also love them tldr