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I'm currently constructing two titan battlegroups for Adeptus Titanicus. When I'm done (as much as one is ever done with an army), I would like to also dip my toes in Legions Imperialis (and maybe other Epic-scale games after that, but let's stick to LI for now). I'd really like to create a thematic and lore-appropriate titan force for LI - I have gotten the impression that this is not all that good in game terms, but let us leave that aside. Specifically, in the books I have read, titans are always accompanied by secutarii - infantry to protect the titans from assault. How would I design an LI army that follows this theme (mainly titans, but with numerically significant infantry support)? I should note that I have not yet actually read the LI rules, and I found it difficult to understand the army building guidelines I could find online.

Perhaps what I'm really asking is "which box of little Mechanicum or Solar Auxilia dudes can I buy and expect to actually be able to use in this titan-themed army?"

(I am aware that there are no actual secutarii models - that's fine; in my interpretation secutarii is a role, not a specific type of unit.)

In LI you have a 30% limit to take whatever allies you choose, in addition the Legio have a support formation called Collegia Titanica Support Cohorts, which does not use points from your allied allowance and mixes Mechanicum detachments with Titans.
So you can basically use what you want...