These do go together as a bold (if gp) sibset
[name_f][/name_f]Avarice does have a pleasing sound but that meaning might be tricky to wear [name_f][/name_f]- I guess it crosses the line between ambition and greed, which is a shame when it doesn’t sound[name_f][/name_f] like it should mean that 
[name_m]Severus[/name_m] is heavy (though I’ve seen people use Severe/ Sévère?) [name_f][/name_f]- but yeah, it is very much attached to HP and that’s not something I’d want [name_f][/name_f] (nor do i think the name will be free of that anytime soon, given remakes etc)
[name_f][/name_f][name_m]Invictus[/name_m] is bold, but six boys were given the name in 2024 (first time it entered the US stats!). I think it could fit in with the likes of [name_m]Chosen[/name_m], [name_f]Halo[/name_f], [name_m]Saint[/name_m] etc. [name_f][/name_f]- and would make a cool middle (as you say, a bit like [name_m]Victor[/name_m], and you’ve got the poem and [name_m]Invictus[/name_m] [name_m]Games[/name_m] link?)