#also worth noting: elf senshi was probably even weaker than an elf with his lifestyle or an equivalent would've been

[because-im-freaking-greed]

Another factor is that Senshi maybe got the shortest end of the changeling stick for his role in the party. As a frontline fighter, going from a dwarf, known for being the strongest and sturdiest humans by a decent margin, to an elf, who rank below humans with similar lifestyles/training methods, was a bigger difference than basically anyone else got, except maybe Marcille.

Now, there are elf warriors in that setting, obviously, but the thing is, Senshi's really not particularly skilled at combat or in trained shape! Normally, he makes due off of being a dwarf, and his pot and knife being made of rare, mythical metals, but he's not really ever shown practicing or even exercising in downtime. He's probably comparable to like, a dude who was a linebacker in highschool getting in a fight. So then, when he becomes an elf and loses the natural strength of dwarves, he has almost no trained strength to fall back on and can barely even carry his pot, much less wield it.

And the other aspect of the shortest stick is the new benefits- the big advantage elves have over other human is their mana capacity; they can channel more to cast more and bigger spells than anyone else, with gnomes a close second. This is, unfortunately, entirely wasted on Senshi, who has no magical training whatsoever. He's so lacking in magical experience that he's notably superstitious at the start of the series. Even Marcille, unable to use much magic due to the difference in natural mana capacity between elves and half-feet, was able to make use of the sharper senses the new body gave her.

Ultimately, Senshi was the only person whose transformation and previous training left him fully unable to fill any combat role for the party, making the difference in his general vibe seem greater.

I like to imagine that Senshi isn't acting that different as an Elf, its just coming across different bevause of his looks.

I like to imagine this is how other Dwarves see him, a delicate pretty boy. It's just other races can't read Dwarf body language that well.

Then he's an elf and suddenly they see his mannerisms in a different light, but he's always been this way. They just didn't have Dwarf Goggles.

Like how other Half Foots instantly clock middle aged Chilchuck but everyone else thinks uwu baby